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How Dogs Became Man's Best Friend - Twice Over

Ancient humans made dogs their best friend not once but twice, by domesticating two separate populations of wolves thousands of miles apart in Europe and Asia. That is the conclusion of scientists who said on Thursday they had used modern genetics to unravel canine evolutionary history, revealing a deep internal split between dogs from opposite ends of the Eurasian continent. People and hounds go way back - they were living together at least 15,000 years ago, or 5,000 years before...

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