Dogs have been man's pet for over 14,000 years.
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George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
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Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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