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Dogs are thought to have evolved from wolves that ventured into human camps, perhaps sniffing around for food. As they were tamed, they could then have served humans as hunting companions or guards. The results suggest all dogs derive from a single extinct wolf population - or perhaps a few very closely related ones.
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Dogs and Humans Evolved Together, Study Suggests.

The findings suggest a more ancient origin for dog domestication than previously suggested.

They also hint that a common environment drove both dog and human evolution for thousands of years.

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