The Two-Week Difference Between Dogs and Wolves

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Catherine thinks this difference of two weeks, this tiny developmental shift, could be the root of what separates dogs from wolves. So she's trying to figure out exactly when this period starts and ends. She puts wolf puppies in a little arena with an object that they've never seen before. And so then we can compare the dogs and the wolves and how much fear they show.

Dogs were the first domesticated animal in history, emerging from wolves some 20,000 years ago. But how did wolves become dogs? To find the answer, scientists have to play with a lot of puppies.

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