A group of pugs is called a grumble.
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Dogs have four toes on their hind feet, and five on their front feet.
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Service dogs are trained to know when they are on duty. When their harness is on, they know they are at work. When you take it off they instantly become playful and energetic.
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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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