About This Quiz
We know that dogs are man's best friend -- they usually enjoy running, fetching, gnawing on bones and showing complete loyalty to their owners. But how much do you really know about how Fido works?The relationship between people and dogs goes back at least 15,000 years, potentially making dogs the first animals to be domesticated.
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From about 15 million years ago, we can subdivide Canidae into three subgroups: foxlike animals, wolflike animals and South American canids, which includes the maned wolf and the crab-eating fox.
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Domesticated dogs descended from wolves.
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Each year, thousands of dogs end up in animal shelters and rescue groups for doing what people have bred them to do. For example, dalmatians were bred to have incredible stamina so they could run alongside their coaches all day -- therefore these active dogs need lots of exercise.
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Dogs might use circadian oscillators -- daily fluctuations of hormones, body temperature and neural activity -- to know when food is likely to hit the bowl or when owners are likely to return from work.
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The Chihuahua is the smallest domestic dog breed, weighing 2 to 6 pounds (0.9 to 2.7 kilograms).
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Dogs have five toes on their front feet and four toes on their hind feet.
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The Irish wolfhound is the tallest breed of dog, measuring 32 to 34 inches (81.3 to 86.4 centimeters) from shoulder to ground.
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Research indicates that dogs see colors, but cannot distinguish between the colors of the spectrum from green to red.
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Toto, which was portrayed by a cairn terrier in the movie "The Wizard of Oz," accompanies Dorothy Gale and her friends down the yellow brick road.
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