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All dogs are descended from wolves, by domestication and artificial selection. This is known because DNA genome analysis has been done to discover this.[11][12] They have been bred by humans. The earliest known fossil of a domestic dog is from 31,700 years ago in Belgium.[13] Dogs have lived with people for at least 30,000 years. In 2013, a study was published that showed that the skull and teeth of a canid, dated to 33,000 years ago, had characteristics closer to a dog than to a wolf, and the authors conclude that "this specimen may represent a dog in the very early stages of domestication, i.e. an “incipient” dog." The researchers go on to suggest that it was, however, a line that did not lead