The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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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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Dogs can make about 100 different facial expressions.
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Dogs sometimes fake being sick to get attention.
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Dogs can be trained to identify the scent of lung cancer long before symptoms develop.
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