Some massive breeds such as the St. Bernard completely lack wolf DNA, but the tiny Chihuahua retains detectable wolf ancestry ...

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Wolf DNA seems to have influenced the size, smelling power and even personality of modern dog breeds, scientists said.

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Their new study, published in PNAS, examined 2,693 genomes from modern and ancient dogs and wolves. It shows that 64% of dog ...

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Those tiny, fluffy dogs walking down the street may look cute but beware – they probably have some wolf in them.

Scientists find wolf DNA in most modern dog breeds, revealing widespread ancestry that shaped size, behavior and adaptation.

Those tiny, fluffy dogs walking down the street may look cute but beware -- they probably have some wolf in them.