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dog is a mammal in the order Carnivora. Dogs were domesticated from wolves as recently as 15,000 years ago[1], or perhaps as early as 100,000 years ago based upon recent genetic fossil and DNA evidence. New evidence suggests that dogs were first domesticated in East Asia, possibly China [1], and the first peoples to enter North America took dogs with them from Asia. Genetic research has identified 14 ancient dog breeds, with the oldest being the Chow Chow, Shar Pei, Akita, Shiba Inu and Basenji. Because many of the 14 breeds are associated with China and Japan, the theory that the dog originated in Asia seems to be likely[2]. Over time, the dog has developed into hundreds of breeds with a great degree of variation. For example, heights at the withers range from just a few inches (such as the Chihuahua) to roughly three feet (such as the Irish Wolfhound), and colors range from white to black, with reds, grays (usually called blue), and browns occurring in a tremendous variation of patterns.
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