This is CBSI on the world.

I'm John Batchel with Jessica Pearson, Mark Beckoff.

We're discussing their new book, A Dog's World, imagining the lives of dogs in a world

without humans.

Mark, immediately physical shape will change.

One thing that comes to me right away is that the snout, I never recognize that as a significant feature of the Canis Fulius Familiaris.

What is the advantage of a longer snout? Why is it that the shorter snout dogs will likely either change or leave us?

Well, the shorter snout dogs may not be able to breathe very well on their own when they're

taking a lot of exercise.

You know, one of the things all dogs are going to have to do is get physically fit, if you

will.

They're going to have to be able to get food and defend food,

find a home range in the territory and defend it.

And if they can't breathe well, then they'll just lose out.

I mean, there's just no other way to put it when they're on their own.

Their site may change, too, because the longer nose dogs

may have better sight.

People have speculated that the length of the nose

might be important in activities such as hunting

or finding their way around.

I'm not sure we really know that.

But the physical attributes of the dogs, you know, body shape, leg length, are going to really change on their own as they begin to breed on their own.

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