All language subtitles for BBC.Horizon.2010.The.Secret.Life.of.the.Dog.HDTV.x264.AC3.MVGroup.org.eng

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We have an extraordinary relationship
with dogs.

We love them
like no other animal on the planet.

What makes our relationship
so special, is perhaps the dog's

ability to be able to read
our emotions so effectively.

They've been around
longer than any other pet.

There are now eight million
dogs living in the UK alone.

The dogs are wonderful.

We've got over 400 breeds across
the world and every one of them
has something special about them.

But only now are we beginning
to realise just how important
that relationship could be.

New research is revealing ever more

intricate connections
between human and dog.

Without that initial starting phase
of dog domestication, civilisation
just would not have been possible.

So why do we love an animal
that was once a fearsome predator?

TRANSLATION:
This fire-breathing dragon
has turned into a human friend.

Could they in some ways
be more intelligent
than even our closest relative?

Suddenly, there were dogs
doing something that not
even chimps could do.

And in the future, what impact
might dogs have on all our lives?

They're going to help us tackle some
of the most dangerous diseases of

our time, diseases that are killing
millions of people every year.

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Corrie!

Come here. Every owner will spend an
average of £20,000 on their beloved
dog in its lifetime. Good boy. Sit.

We treat them as if they
are fellow human beings

with all the thoughts, feelings
and emotions of a family member.

Good girl. It's an
incredibly close relationship.

We share our lives, our homes,
even our beds with them.

We're very close. We're best
friends. Pippin sleeps with us.

He loves being in the bed
with his head on the pillow.

He just seems to fit in with

your lifestyle. She's there with my
slippers first thing in the morning.

She's part
of the family, she IS the family.

For decades,
science has dismissed dogs as being
unworthy of legitimate study.

But all that has changed.

Scientists are now attempting to
understand dogs like never before.

How deep is the bond between us?

Where did this relationship
come from? And ultimately, why is it
dogs that are man's best friend?

Dogs are all over the world,
they're everywhere.

Anywhere you find humans, you
will almost certainly find dogs.

We're now beginning to realise
that we can answer certain questions

in dogs that we can't really
answer in any other species.

There's been this explosion
in dog research, I think,

because they are specially tuned
into humans and this makes dogs
extremely interesting as a model.

Here at the University
of Lincoln, Professor Daniel Mills
is fascinated by dogs.

Using state-of-the-art technology,
he wants to find evidence of how
close our relationship really is.

What we're trying to do here is see
the world from a dog's perspective
rather than just impose our own

views as to how we think
the dog sees the world.

He's attempting to discover
if dogs are as good at reading
our emotions as their owners claim.

He'll know
what I'm thinking even before
it's turned into a thought bubble.

He is clearly an animal, I accept
that he is totally an animal.

I am not under any illusions that
he isn't but he's more knowing than
I would expect an animal to be.

He will look at me with sorrowful
eyes and then give me one big lick on
the hand as if to say it's all right.

It's this sixth
sense that dogs have.

One of the things that
a lot of people comment on

is that dogs seem to be naturally
attuned to them and be able to
sense their moods and whatever.

Part of our work here is to look
into the scientific basis of that.

The key to a dog's ability to read
our emotions might lie in something
we all do without knowing it.

When we express our emotions in our
faces, we don't do it symmetrically.

It's been shown that if you take
somebody's face when they're
expressing some emotion like

happiness or anger or something
like that, there is a difference
between the left and right side.

Composite faces consisting
of two right or two left
sides look very different.

One theory is maybe our emotions

are more faithfully presented
in the right side of our face, and
that's the side that we tune into.

When we look at a face, we have
what's known as a natural

left gaze bias so you naturally look
much more towards the left, ie the
right-hand side of somebody's face.

Eye tracking software
has demonstrated that

when presented with a human face,
we nearly always look left first.

Daniel Mills wanted to find out
if dogs used the same trick
to read human faces.

Shifting the direction
of your gaze we thought

thought was fairly unique to people
until we started looking at dogs.

Tess, Tessy!

To test the theory, his team
recreated this experiment with dogs.

Bruce, what's that? They presented a
series of images showing human faces,

dog faces and inanimate objects
and recorded the direction of
a dog's gaze with a video camera.

We found that dogs when they are
looking at pictures of dog faces

or objects, they will look
randomly on the left or the right.

But when it came to human faces,
they made a remarkable discovery.

So now we have Tess looking at
a human face so first she's looking
in the middle of the screen.

Here is the first eye movements
on the left.

She's in the middle and she's going
on the left, and then the dog is
going to be even more on the left.

So now this is Moose
and then we can see really well
that this is a left gaze.

From here to here.

We can see the white here.

She's even moving her head.

As far as we know,
no other animal has this
relationship with the human face.

Dogs don't do this with each other.

Incredibly, it seems
they've acquired a new skill
to enable them to read our emotions.

Being able to detect when somebody
is angry or potentially harmful,

you could understand that there may
be a biological advantage in being
able to read people's emotions.

Equally, it makes sense for
a dog to approach somebody
when they're smiling.

If dogs can
read human emotion, and increasingly
the scientific evidence is beginning

to point in that direction, that's
going to form the basis of a very
powerful bond between human and dog.

Evidence like this appears
to underpin our conviction

that dogs understand us
in a way that other animals cannot.

But for many dog owners,
this unique relationship
is much more than a one-way street.

I like to think we understand him.

Yes, but he woofs and we talk.

That's because he wants
to be part of the conversation.

If he's bored,
he'll take a deep sigh and go...

SHE WHINES LIKE DOG

He's got a bark when he wants
to go out and he's got a bark...

SHE WOOFS

And a bark when
he hears strange noises.

Sometimes when he tells
the kittens off, he goes...

like that.
SHE WOOFS

If you're in a certain mindset,
you can almost understand
what they're thinking.

The idea that we can understand
barking almost like a language has
always been dismissed by scientists.

But in Hungary, they are trying to
see if there's any evidence to back
up the claims made by dog owners.

Here, at Eotvos Lorand
University in Budapest,

is the world's first research
facility dedicated to investigating
the human/dog relationship.

Dr Adam Miklosi wants
to see if we humans really can
understand dogs' barks.

Today, he's out on a field
expedition collecting recordings.

Scientists used to think that
barking is a random noise without
any specific information or content.

However, we have a different idea.

Dogs might tell us something
about their emotions, anger,
fear, happiness, despair.

These are basic emotions which
I think humans might be able
to recognise in the barking sound.

To test this idea,
Adam and his team acted out

a number of scenarios, provoking
dogs to bark in different ways.

But when the recordings are played
back to people, will they be able
to match the bark to the emotion?

Alone bark.

THE DOG BARKS

That sounds like a dog
asking for attention.

It's anxious. It's sad.

Distressed.

Want to be let off a chain
or something like that.

THE DOG BARKS

I think that one's playful.
Excitement.

It seems as though they're actually
asking their owner for something.

It sounds as if it may want
a ball or a toy or something.

She could be playing with it.

THE DOG BARKS

Angry.

This is a sound that she would
make if she saw somebody behind
the fence walking along.

it's a stranger encroaching
on territory.

The results of Miklosi's research
are remarkable.

It's proved there's incredibly
strong agreement between people
about what different barks mean.

'Overall in the study, you could see
that people can discriminate'

six barks and most of them were
quite successful in this.

Dr Miklosi has developed
a system to analyse the barks.

It's helped him decode
how dogs communicate meaning.

I measure the three features
of this sound.

One was the frequency, the other was
the tonality and the third was the
interval between the barking sounds.

Probably, this is also what
the judgment of people is

based when they are describing the
bark in terms of emotional content.

But what's more surprising is not
our ability to interpret the barks,
but what it reveals about dogs.

In the natural world, dogs'
wild relatives don't really bark.

Amazingly, it seems that during
the course of domestication,
dogs may have evolved

their elaborate vocal repertoire
especially to communicate with us.

'At the basic level, everyone can do
it and there is a good chance that'

barking is a very good means
to communicate with humans.

The evidence from these recent
experiments seems to confirm what
dog owners have asserted all along,

that we're incredibly attuned
to each other in a way that
no other two species are.

But new research has uncovered that
the bond between humans and dogs
may be even deeper.

Research has turned to the most
powerful bond, that between
mother and baby, for clues.

It's really hard to describe.

It's just an amazing feeling.

In Sweden,
Professor Kerstin Uvnas-Moberg
has been studying the role

of the hormone oxytocin in bonding
mothers with their newborn babies.

Oxytocin is a little, little
heptide hormone.

It's just nine amino acids.

It's produced in a very old part
of the brain called the hypothalamus

and oxytocin helps the mother
quickly establish the positive
feelings and the bond to the baby.

Each time a mother breast feeds,
she has a new release of oxytocin
and this reinforces the bond.

It's sort of in a way

difficult to understand how
you can be familiar with somebody

who is actually a stranger
so quickly, don't you think? Yes.

Professor Uvnas-Moberg believes
oxytocin plays a similar role in the
bond between dogs and their owners.

A lot of people would say,
"Oh, it's not possible, dogs
and humans, we're not the same.

"dogs and humans,
it's very, very different."

But I would say that people who have
dogs, who are used to animals and
used to interaction with animals,

they would say,
"Oh, that's not so strange."

To test the theory,
blood samples were taken

from dogs and their owners
before and during a petting session.

'We had a basal blood sample
and there was nothing and then we

'had the sample taken at
one minute and three minutes.'

You could see this beautiful
peak of oxytocin.

'The fascinating thing is that
the peak of oxytocin is similar'

to the one we see
in breast feeding mothers.

Surprisingly, it's not just
the owners who are affected.

Blood samples taken from dogs
reveal a similar burst of oxytocin.

It is a mutual kind
of interaction, you know.

The owner touches
with her hands and they both smell,

hear and see each other. That
is a very nice way of triggering
oxytocin release in the two of them.

Oxytocin has
a powerful physiological effect.

It lowers the heart rate
and blood pressure,
leading to reduced levels of stress.

Research indicates that owning a dog
could even extend your life.

If you have a dog,

you are much less likely to have a
heart attack and if you have a heart
attack, you are three to four

times more likely to survive it
if you have a dog than if you don't.

So where does this incredible
relationship come from?

When did it start and how?

It's a question that has puzzled
scientists ever since Darwin.

He recognised the special
relationship we have with dogs
but was at a loss to explain it.

Darwin couldn't even say
for sure which animal was
the true ancestor of the dog.

It's a complex puzzle
that both archaeologists

and molecular geneticists
have been working to solve.

There's a huge amount of
variation in present-day dogs.

Consider the difference between
a Pekinese and a Great Dane.

Could they really all
be descended from one wild ancestor?

It could have been a coyote
that might have intergressed
with a wolf and then that may

have been slightly selected upon to
create one particular breed of dog,
or jackals or African wild dogs.

Any number of these other
dog-like species that are out there

must have come together and that's
where that variation must have come.

Until the advent of
molecular genetics,
archaeology had few firm answers.

All you have to play with are
the bones and so when you look
at the bones, if you don't have

a very small flat-faced round-headed
pug in the archaeological record,
you don't know where that came from.

Those are questions that before
genetics you really couldn't answer.

To unravel the evolutionary
origins of dogs, molecular

geneticists compared DNA from dogs
with that of their wild relatives.

Specifically, they looked at
mitochondrial DNA sequences

which are passed unchanged
down the maternal line.

What's so useful for scientists
is that mitochondrial DNA
changes little over time

and so acts as a kind of signature
left by an animal's ancestors.

Those markers in domestic dogs
show them to be much more

closely related to grey wolves
than they are to any other species.

There's no admixture so we never
see a mitochondrial signature of

an African wild dog,
jackal or coyote in a domestic dog.

Thousands upon thousands of
mitochondrial DNA that has been

extracted from domestic dogs,
every single one of them
just looks just like a grey wolf.

It's now without doubt
that dogs are domesticated wolves,

but how and when did it happen?

Again, the archaeological record is
inconclusive. What is clearly a dog?

Clearly, a dog is something
which is clearly not a wolf.

Well, here's a wolf skull and as you
can see it's a long, quite low skull
with a relatively flat top.

The teeth are quite large
and the thing is quite narrow.

Compare that with a domestic dog.

This is a cairn terrier
and as you can see,

the process of domestication
has gone really quite a long way.

The whole face is very much
shorter, it's been contracted
towards the brain case.

The brain case itself
has a much steeper front
and a much more bowed upper surface.

If you found that,
you would be in no doubt you were
dealing with a domestic dog.

But this is a domestic Alsatian
and telling these apart really
would be substantially difficult.

And since early dogs were probably
very wolf-like, it's hard to pinpoint

when domestication happened
by looking at the shape of the bones.

The best I can give you
is around 12 or 13,000 years ago.

We start seeing the first
things that everybody would
accept as being domestic dogs.

But mitochondrial DNA offered
a different set of clues.

The original genetic data that were
coming out seemed to suggest that
domestication was happening on

a far earlier timescale than
was suggested by anything
in the archaeological record.

The first dates that were coming
out were on the order of 100,000

years or more,
which a lot of archaeologists
raised their eyebrows at.

It's hotly debated exactly
when dogs were domesticated,

but there's one thing archaeologists
and geneticists agree on:

our relationship with dogs goes
back thousands of years further
than with any other pet.

It was a time when we were
still hunter-gatherers.

Dogs were certainly the first
animal to be domesticated,
and they fit into hunting and

gathering societies probably better
than any other species out there.

At this stage when we're hunting and
gathering and killing wild animals,

after you finish with them you're
creating a relatively large pile

of bone and leftover meat,
things that these wolves would
have been very attracted to.

Those wolves that were able to take
advantage of that resource, and were
a little bit less afraid and could

approach the human camp, were then
setting themselves up into
a closer relationship with humans.

We are carnivores,

we are social carnivores, we hunt
in groups and we hunt in daylight.

There are not many other species
that do that.

The wolf is a social carnivore that
hunts by daylight, and therefore,

there's natural potential for
teamwork between those two species.

We became much better hunters
with dogs.

We are more successfully taking down
large game, which means we have more
food to eat, which means we can have

more offspring, which means the
overall populations of humans grow.

Dog domestication may have helped
pave the way for a fundamental
change in human lifestyle.

It's hard to see how early herders
would have moved and protected

and guarded their flocks without
domestic dogs being in place.

And one has to wonder whether
agriculture would ever really have

made it as a viable alternative
to hunting and gathering.

Some believe that the influence
of dogs on our development
was not just important, but pivotal.

Dogs absolutely turn the tables.

Without dogs, humans would
still be hunter gatherers.

And without that initial
starting phase of dog domestication,

civilisation would
not have been possible.

We look at our dogs
and we see an intelligence,

an ability to interact with us
unlike any other domesticated animal.

But are dogs really that clever,
or are they just dumb animals taught

to perform tricks
that mimic human behaviour?

I think she's very smart.
She learns tricks fairly quickly.

If I am packing a suitcase,
they will go and sit in

the suitcase because they know that
suitcase is going to go somewhere.

When I'm talking to him
most of the time,

his little head usually jilts to the
side as if he knows what I'm saying.

I do talk to her and she picks up on
what I say to her.

I know it sounds stupid, but I do
have a conversation with my dog.

But how does
the intelligence of a dog
really compare in the animal kingdom?

New research is discovering that in
certain ways, dogs may actually think

more like us than any other animal,
including our nearest relative,
the chimpanzee.

Of all the questions around
the evolution of human cognition,

of course, people would focus in
on chimps quite naturally.

Suddenly, there were dogs doing
something not even chimps could do.

Cognitive psychologist
Juliane Kaminski from

the Max Planck Institute in Germany,
has been comparing chimps with dogs
in a series of revealing experiments.

At Leipzig Zoo, Juliane is testing
chimps to see if they can understand

human gestures, like pointing,
to find a hidden treat.

As simple as it seems to us,
even our nearest primate relatives
failed the task miserably.

She's not really focusing on me and
she's simply making her own choice.

Most of the time you can see
that she makes a decision
long before I give my gesture.

She doesn't even wait
for my information.

It's such an uncooperative
attraction, so it's like really I'm
providing information for her to

find food, which is just simply
something which would never
happen in a chimp group, really.

A chimp wouldn't go like,
"Oh, look there's the banana",

and then another chimp
could go and get it.

Since we're the only species
that makes this gesture,

it would be remarkable
if any animal could understand it.

But dog owners take it for granted
that their dogs respond to pointing.

Good boy!

For Kaminski, it's proof of their
extraordinary social intelligence.

If you really look at that gesture,
it's an informative gesture.

So it's in its essence
a very cooperative

interaction, so I'm really
helping you to find something.

And for dogs, following, pointing
seems to be very natural, and it
makes dogs extremely interesting.

In fact, dogs are so
tuned into our social cues,

they can even pick up on something as
subtle as the direction of our gaze.

Humans have unique almond-shaped eyes
with exposed white sclera
visible on each side.

One hypothesis is that we have
evolved those eyes because
we use it for communication.

With human eyes you can really tell
easily which direction I'm looking.

We think that maybe dogs
are really tuned into that,

and really are interested in
human eyes because of that.

But these aren't skills
that dogs use with each other.

They are abilities dogs
only use with humans.

I think it's very, very
easy to imagine that they
develop special skills in

interacting with humans, because
that's their new social partner.

So they kind of learn to interpret
human communication, which is
different from dog communication.

So they kind of learned a second
language, so you could probably
say they are bilingual, yes.

Even puppies as young as six
weeks old seem to intelligently
respond to human gestures.

At least some of the time!

The fact they're quite young puppies
can do something,

if they learn it, they learn it very
quickly, and it's obviously that

they are ready to do it - so from
the very beginning they are ready
to receive human communication.

As dog owners, we think we understand
the limits of our dogs' intelligence.

But now some dogs are
challenging our assumptions.

We may have to reconsider
how clever dogs are.

Juliane Kaminski has discovered
a remarkable dog living in Austria,
just outside Vienna.

She's conducted a series of
experiments, and is amazed
at the dog's intelligence.

Known only the pseudonym Betsy,
the true identity of this

seven-year-old border collie
is a closely guarded secret.

She can distinguish objects by name,

which is really amazing,
and she has many, many words.

Kase.

Das Zebra.

With a vocabulary of over 340 words,
Betsy is pushing the boundaries of
what we think dogs are capable of.

Karotte.

Sandwich.

I think it was when she was four
or five months old,

when she spontaneously started
to connect human words to items.

When we were discussing
shall we play with the rope,

or with the ball, she immediately
started to bring those items.
So it was actually her idea.

And from this time on we started to
really train her on different words.

It was maybe one toy per week,
and it worked.

I think on average
a well-trained dog maybe knows
like 15 commands or something.

There are just very few individuals
who can do what she does.

I can tell that I tried it with my
own dog and it didn't work at all.

So he could maybe distinguish
two objects after a while
and after extensive training,

but she is really able to learn
this easily and more than 300
objects, that's pretty amazing.

Betsy's understanding of vocabulary
rivals that of a two year old,

so Kaminski decided to test her on
other key developmental milestones.

Can you go find me one
of them over there? Yeah?

Two year olds
are just beginning to understand

the use of physical symbols, such
as scale models in communication.

Though it looks easy, it requires
abstract thinking way beyond the
capability of almost all animals.

But would Betsy be
able to do this too?

SHE SPEAKS GERMAN

This was something the owners have
never tried before, so when I came
and I said, "I want to do this,"

they were like, "No way,
that's not going to work", but I was
the first one doing it with her.

And she had no problem
doing it right from the beginning.

This is surprising because in its
essence if I hold out an object,

she turns it into
something communicative,

and that's so interesting.

What about this one? Children also
begin to grasp that a drawing or
photograph can depict a real object.

Thank you very much, well done.
No other dog has ever achieved
this under trial conditions.

But once again, Betsy picked
this up almost immediately.

In its essence the picture is
something very different as the
object, so it's a piece of paper

and it's two-dimensional,
but it's representing something,
so she obviously interprets

that as representing an object, a
three-dimensional object, and that's
so interesting that she does this.

I know exactly what you want.

This is the one you want and I'm
going to go and get it for you.

SHE SPEAKS GERMAN

Kaminski is unsure how many dogs
might have similar abilities,
but Betsy is proof

that certain dogs may have the
potential to be more intelligent
than we ever thought possible.

So how did the dog acquire
these unique abilities?

Did they evolve them over
thousands of years,

or is it the way dogs
have been brought up
in a human environment that counts?

Dogs and wolves are still
the same species today.

They can easily interbreed.

Overall, wolves and dogs are
99.8% genetically identical.

Given they're biologically so
similar, is it the way we raise
them in our homes that makes a dog?

Scientists in Hungary
set out to answer this question.

We wanted to see whether the special
relationships between humans

and dogs are due
to nature or nurture.

So we wanted to see what happens
if a wolf is raised

in a human environment,
in a home, whether it would
act like a dog or not.

A litter of five-day old
wolf cubs was taken from
a wolf sanctuary outside Budapest.

A group of young researchers
became their adoptive parents,
caring for them 24 hours a day.

As a control for the experiment,
they'd already raised puppies.

Now they aimed to raise
the wolf cubs the same way.

So we were especially nice with our
cubs, because we wanted to maintain
a very good relationship with them.

They were really cute,
so it was not very difficult to
carry them everywhere we were going.

And we also slept together
with the cubs.

So the bonding, it was good.

I really liked my cubs
and there was a really strong
relationship between us.

But then something began to change.

Despite raising the cubs in the same
way as the puppies, by eight weeks
the differences had started to show.

Dog puppies were always interested
in what I was doing.

There is a very strong co-operative

tendency in dogs
and this was missing in wolves.

They had their own ideas,
they were not much interested
in my activities.

The researchers wanted to find
out what was going on,
and decided to run a series of tests

comparing the wolf cubs
with puppies of the same age.

TOY YAPS

Unlike dogs, the wolf cubs
didn't respond to pointing.

In fact they hardly made eye
contact with humans at all.

The cubs were behaving
as they would do in the wild.

CUB GROWLS

She was really possessive.

If she wanted to grab an object, it
was really difficult to get it back.

And if we wanted
to open the refrigerator
and have breakfast,

the pup was immediately
in the middle of the
refrigerator and grabbed something.

It is not like with a dog that
you say, "No, you shouldn't."

It just didn't care.

The battles continued to get worse.

After the second month, we started
to have more and more conflicts

and the wolves wanted
to destroy everything.

And of course
when the cub is a small cub,

it's nothing, but when they reach
40 or 50 kg, you know,

it starts to be really dangerous.

We just could not keep
them in the house any more.

Hoo!

After four months the cubs had
to be returned to the reserve.

The experiment had proved
that upbringing has little impact.

It's impossible to turn
a wolf into a dog,
no matter how much you nurture it.

So according to our experiences, the
dog is not a socialised wolf at all.

These differences we experienced
in the community viability

and in the social behaviour
of dogs, this is the effect
of domestication.

The difference must lie in the
way dogs have been bred by
humans over thousands of years.

Their unique abilities
are now part of their nature.

But how did dogs evolve
these innate attributes?

What was the process that made them
intrinsically tame?

A remarkable experiment in Siberia
may hold the key to understanding
how wolves turned into dogs.

CAR HORN TOOTS

50 years ago, Soviet scientists
set up a breeding programme
to try and domesticate silver foxes.

The scale of the project has opened
a remarkable window on domestication.

It's become a focal point for
scientists across the world.

Here on a farm
outside the city of Novosibirsk,

the experiment still continues today,
overseen by Dr Lyudmila Trut.

The breeding programme began in 1959
when the first foxes were
selected from local fur farms.

TRANSLATION: We approached
the animals in the cages

and recorded their reactions to us.

We could see that some of the foxes
showed aggressive behaviour.

Others were frightened.

But only 1% of them showed neither
signs of fear nor aggression.

This 1% was selected to become
the founding generation
of a new population of foxes.

At every generation, the selection
process was repeated with only the
tamest foxes being allowed to breed.

Within just three generations,
the aggressive behaviour
began to disappear.

TRANSLATION: The radical changes came
through in the eighth generation,

when foxes started to seek
contact with humans

and show affection to them.

The amazing thing was that cubs
who had just started to crawl,
opened their eyes

and started showing
affection to humans

while breathing heavily,
wagging their tales and howling.

This kind of response
was a big surprise to us.

Half a century on,
the 50th generation
of foxes are tamer than ever.

It's an accelerated model
of how dogs might have been
domesticated from wolves.

But tame foxes alone cannot
unravel the mystery of domestication.

A parallel group of silver foxes
have also been bred to retain
their aggressive behaviour.

TRANSLATION: It just bit my hand.

TRANSLATION: I didn't even
open the cage.

I just put my hand up and it managed
to bite me through the bars.

This isn't a fox - it's a dragon.

It's allowed researchers to make
unique comparisons between tame
and aggressive foxes.

TRANSLATION: We did an experiment
with cross-fostering

where we gave tame cubs
to aggressive mothers.

and vice versa. We found out that the
mother's behaviour does not influence
that of the cub.

This cub was brought up
by a tame mother.

It showed something remarkable,
that the difference

between tame and aggressive foxes
is largely in their genes.

TRANSLATION: We even took the
experiment one stage further
and transplanted embryos

from aggressive mothers
into tame mothers,

but the results were the same.
It proved that you can't change
the gene of aggressiveness

and it will be kept and preserved
for the next generation.

Geneticists have already
located several genetic regions
responsible for tameness.

They're now taking blood samples
from tame and aggressive foxes

in an attempt to pinpoint
the specific genes.

Dr Anna Kukekova, a molecular
geneticist based at Cornell
University in the USA,

has travelled over 5,000 miles
to study the foxes.

Behaviour is complex.

We're pretty sure there will be
not a single gene different

with the orchestra of genes

which is responsible
for this behaviour.

She's hoping that once the precise
genes are identified, it will lead

to a better understanding
of the biology of tameness.

He is like a doggy,
you know, like the puppy

who's very happy when somebody
picks him up from the floor.

It's unbelievable how they trust,
how they trust people and
I just really admire these animals.

TRANSLATION: So within 50 years
of our intensive selection process,

this fire-breathing dragon has turned
into a human friend.

If foxes were brought up
in a domestic environment,

interacting with other animals
and humans, they would make
fantastic pets.

They are as independent as cats,
but, at the same time,
as devoted as any dog could be.

But it's not just the fox's
behaviour that has changed.

Just a few generations into the
experiment, scientists began
to notice a curious phenomenon.

The normal pattern and silver colour
of the coat changed dramatically
in some of the tame foxes.

Their tails often became
curly instead of straight.

Some young foxes kept their floppy
ears for much longer than usual,

and their limbs and tails
generally became shorter
than their wild counterparts.

In effect, the tame silver foxes were
beginning to look more like dogs.

What this shows is that when
you select against aggression,

you get almost all the same
suite of changes that you see
when you compare dogs to wolves.

American anthropologist,
Professor Brian Hare has visited
the breeding programme in Siberia.

He believes it shows that if you
select for tameness, changes in
appearance will naturally follow.

I think the surprise when thinking
about dog origins is that

there's so many ways
that dogs are different from wolves.

So is it that you had to select for
each of these traits individually?

Well, the answer from
the fox work is no.

If you just select for behaviour,
a lot of the morphological
and physiological changes

between wolves and dogs,
get dragged along.

You end up with this
crazy variance, you know

floppy ears, curly tails,
you know, all these other things
that are really cute to talk about.

So you get a lot of stuff for free
when you select against aggression.

It's enabled him to draw some
surprising conclusions about
the process of domestication.

When you're selecting against
aggression, what you're doing is
you're favouring juvenile traits.

Juveniles and infants show
much less aggression than adults

and so what the idea is,
is that you know

basically you've frozen development
at a much earlier stage

and so you have an animal
as an adult that looks and
behaves much more like a juvenile.

The theory is that dogs are
in many ways like juvenile wolves.

It explains how dogs could have
begun to look so different
from the wolves they came from.

It's amazing that you get
this variance

that's hidden under the surface
that expresses itself.

And then later people can directly
decide, "I really like the one

"with the curly tail
and I'm going to put them together."

And then you can end up having
dogs that you know sort of shift
in ways that people want them to go.

In the past few hundred years,
we've taken dogs' infantile features

and emphasised them even further
through selective breeding.

We've created hundreds
of breeds to fulfil different roles,

but some of them have been
bred purely for their looks.

I think this kind of breeding
really tells us a lot

about what kind of people we are,
what it is that we like about dogs.

How would you to describe Laddy
in one word.

Uh...

..cute.

Cute, yeah.

Cute, adorable and funny.

I just look at her and I just smile.

She's particularly cute
when she's sleeping.

We all know we find them cute,
but what is it exactly that makes
us respond to dogs so powerfully?

Psychiatrist, Morton Kringlebach,

has a theory
as to why the way dogs look
has such a profound impact on us.

The need to nurture I think is
something that is so deep in us

that we find it
very difficult to resist.

Dogs, puppies have very infant-like
features and maybe that's
one of the reasons why we think

they are so cute is that they remind
us of the infants that we are -
so to speak - programmed to like.

There's something about the way that
the facial features are organised
that makes us want to care for them.

It's about having a large forehead,
it's about having large eyes,
big ears...

And there's something about that
that almost unconsciously we cannot
help ourselves but actually like.

Are you feeding him now?

We're just going
to go one more scan.

Dr Kringlebach is interested in
exploring how strongly we respond
to these infantile features.

A state of the art MEG scanner
was used to measure
people's brain activity

while they were looking at
images of baby faces and adult faces.

We found that within a seventh
of a second there was activity
in the frontal part of the brain,

just over the eyebrows,
in the orbitofrontal of cortex that
was present when you were looking

at the infant faces but not when you
were looking at the adult faces.

This part of the brain is very much
involved in emotional responses,
and so what we think we may

have stumbled across here is really
in many ways the brain equivalent
of the parental instinct.

There's almost like a wired-in
automatic reaction.

Kringlebach is now testing
to see if we have a similar
response to dogs' cute features.

The data is still being analysed
but he suspects

there will be a comparable signature
in regions of the brain associated
with nurturing responses.

Just as with the infant,
when you're looking at dogs,

you find it very hard to control
your emotions, you find it very hard
not to get that need to nurture.

Wow, look at that! What a nice belly!

Oh, you're so cute, yes you are.
Oh, yeah!

But responding to pets as though
they were children can be seen
in a very different light.

I think we can think of little
puppies brought home as parasites.

They don't do anything useful,
they're not perceived

as a food source,
they're not perceived as a guard dog.

They are simply brought home for fun.

They are essentially
moving our focus away from having
children on to having pets.

I think it's safe
to say that dogs have
evolutionally been very successful.

If you compare them to wolves,
you'll see that wolves are now
an endangered species

while dogs, of course,
are all around the world.

The cuckoo is perhaps
quite a good analogy,
because the baby cuckoo, of course,

being planted in somebody
else's nest, prompts mother bird
to look after baby cuckoo,

even though there's nothing
in it for the mother bird at all.

They actually, through
their behaviour, through their
looks, get exactly what they want.

They may be parasitic in that
we cannot help ourselves,
but what we get

in return is probably sometimes
much greater than what we put in.

Experiments have proved what
dog owners have always suspected.

After thousands of years living
together, dogs are attuned
to us like no other animal.

New research has taken our
understanding of how dogs evolved

to a whole new level
and getting us closer to exactly
what it means to be tame.

Now dogs could be about to provide
us with the greatest gift of all.

When it comes
to combating human disease,
dogs could hold many of the answers.

They're going to help us tackle
some of the most dangerous diseases

of our time that kill
millions of people every year.

Dr Elinor Karlsson, a geneticist
at the Brode Institute, Harvard,
is on the hunt

for gene mutations that
could throw light on human diseases.

I think there's hundreds
of diseases that are in common
between dogs and humans.

There's diabetes, there's various
cardiac diseases, there's epilepsy,

there's a lot of different cancers -
bone cancers, breast cancers,
brain tumours.

The narrow gene pool
within a dog breed

makes it far easier to pinpoint
genetic mutations than in humans.

For more than 200 years,
people have been making up
all of these different breeds,

and now we can just use
them to study genetics.

If you looked in a population of
humans, all the people in a country
like the UK,

you'd have quite a lot of genetic
variation across them. People would
be quite different from one another.

But within a breed,
dogs are very similar to each other.

Particular dog breeds are prone
to certain diseases, and this makes
them incredibly useful to study.

Today, the team are taking
blood samples from boxers,

a breed that is susceptible
to a fatal heart disease
called cardiomyopathy.

What happens is they have

irregular heartbeat,

and it compromises blood flow
in their body,

so it can cause collapse and also
it can cause sudden cardiac death.

It's an invisible disease that
affects humans, too, causing sudden
death in apparently healthy people.

The DNA in boxers' blood
could hold vital clues to the
genetic causes of the disease.

Dr Karlsson is part of the team
that in 2005 mapped the dog genome,

all 2.4 billion letters
of the dog's DNA code.

Once we had the dog genome sequence,
we could design a gene chip,
which would allow us to compare

all of our sick dogs and our healthy
dogs and find the genes
that are causing diseases.

Using a genotyping machine,
Dr Karlsson is able to simultaneously
analyse thousands of regions of DNA

from boxers with
and without cardiomyopathy.

What you see when you compare sick
dogs to healthy dogs and go across
the genome from chromosome one

to chromosome two and across
is that most of the points

are right near zero and there's not
a lot of differences between the
healthy dogs and the sick dogs,

until you get to chromosome 17,
and there all of a sudden you have
a huge number of differences.

This is exciting, because this means

this is the region of the genome
that holds the gene
causing our disease.

Karlsson's team have
honed in on this region
to pinpoint the exact gene.

We've found a gene related
to sudden cardiac death.

We think there's another one because
we haven't told the whole story yet.

But we think we know
what the mutation is in
that gene causing the disease.

Now the mutation
has been identified,

the team have been able to locate
the corresponding gene in humans.

It's accelerated a process
that, without dogs,
could have taken decades.

By knowing what gene
is causing it in dogs,

we have an idea that this gene
can cause this disease in humans.

I think that there's
probably a lot of diseases
that are so complicated in humans

that if we didn't have dogs
it would take us a long time
to start piecing it together.

Dogs basically give us
a huge head start on that.

So I think this puts the benefits
that dogs give us on a whole new
level, and I think

if they can help us cure those
diseases, then we can really say
that dogs are good for our health.

It's a very important part
of life to actually know a dog.

And especially a dog
that adores you like this
has got to be good for yourself.

It's kind of impossible
to have a bad day

when you're coming home to a
wet nose and a waggy tail, I think.

I can't imagine life without her.

It's quite strange. We weren't
lacking anything before we had him,

and yet now we would feel that
we were lacking if he wasn't here.

They just enrich your life.

They are the best thing ever.

They keep you young.

For a pet that's been
around so long,

dog research is an astonishingly
new area of science.

It's a very basic human need
to have social relationships,

and one of the wonderful things about
dogs, of course, is they offer you
a way of giving unconditional love

and receiving unconditional
love in the other end.

Dogs are the ones that live with us
in the same environment.

They've been selected to live
in this new environment, and they
are specially tuned into humans,

so humans are
their natural social partner.

But we're only just beginning
to recognise their full potential.

Understanding dogs has the capacity
to give us insights into disease,

the human mind
and our very existence.

I think one reason that there
are almost seven billion people
on earth is in large part

due to the role that dogs have played
in our evolutionary existence.

While we can have good relationships
with a wide variety of animals,
historically, our relationship

with dogs seems to have been the
longest one with any domestic animal.

Personally, I don't think it's
any coincidence that the dog is
referred to as man's best friend.

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