Ancient dog skeletons
Two dogs buried together in Illinois. The remains date back to between 660 to 1,350 years ago. Credit: Courtesy of Illinois State Archaeological Survey, Prairie Research Institute.

Ancient dogs arrived in the Americas alongside humans more than 10,000 years ago but were later wiped out by European colonization, a new study suggests. In fact, besides a few genes in some modern dogs today, the only trace of the original American dogs in today's canines is found in the form of a common canine tumor, according to the study, published today (July 5) in the journal Science.

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