Wolves and dogs evolved into separate species approximately 100,000 years ago. The reason for this split, whether it was as a result of some human influence, different food supplies/hunting strategies, or any other of hundreds of possible things is unknown. For some reason, once there was a split into two separate species, both continued to thrive. About 30,000 years ago, humans and dogs began working together and the domestication process began, although the oldest evidence of a real working relationship has only been found as far back as 14,000 years. By this point, wolves and dogs were two separate species, and it was simply that dogs were the ones who established a working relationship with humans.
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