The world's largest dog was a Great Dane named Zorba, who weighed 343 pounds.
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One female dog and her female children could produce 4,372 puppies in seven years.
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The heaviest breed, the Mastiff, weighs about 200 pounds.
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In ancient China, people kept warm by putting dogs up their sleeves.
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A dog's sense of smell is about 10,000 times stronger than a human's.
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The phrase "raining cats and dogs" originated in 17th century England when it is believed that many cats and dogs drowned during heavy periods of rain.
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A Russian dog named Laika was the first animal in space, traveling around Earth in 1957.
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It is not possible to know how many puppies a dog will have just by looking. The appearance can be very deceptive.
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Irish Wolfhounds, the tallest breed, are 30 to 35 inches tall.
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Dogs who bark the most: Miniature Schnauzers, Cairn Terriers, Yorkshire Terriers, Fox Terriers and West Highland White Terriers.
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Endal was the first dog to ride on the London Eye (the characteristic ferris wheel in London, England), and was also the first known dog to successfully use a ATM machine.
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Dogs sleep for an average of 10 hours per day.
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The term "dog days of summer" was coined by the ancient Greeks and Romans to describe the hottest days of summer that coincided with the rising of the Dog Star, Sirius.
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The oldest known dog bones were found in Asia and date as far back as 10,000 B.C. The first identifiable dog breed appeared about 9000 B.C. and was probably a type of Greyhound dog used for hunting.
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There are almost 5 million dog bites per year; children are the main victims. Dog bites cause losses of over $1 billion a year.
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