Old dog, new tricks: Study IDs 9,400-year-old mutt

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Early Dog
This photo made in Feb, 2010 shows a bone fragment of a dog skull discovered in the Hinds Cave in southwest Texas. University of Maine researcher Samuel Belknap III found a bone fragment of what he says is the oldest-known domesticated dog in North America, while examining a waste matter recovered from the cave. (AP Photo/Robert F. Bukaty)