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The dog is a domesticated type of the gray wolf, which is a member of the Canidae family of the order Carnivora. The dog was the first animal to be domesticated, and has been the most widely kept working, hunting, and companion animal in human history. Dogs were domesticated from gray wolves about 15,000 years ago and perform many important roles. Some of the many important roles that they did were hunting, herding, pulling loads, protection, assisting police and military, companionship, and, more recently, aiding handicapped individuals. This impact on human society has given them the nickname "Man's best friend" in the western world. In 2001, there were estimated to be 400 million dogs in the world! There are still dogs today, as well as wolves.

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  • A dog's heart beats much faster than a human heart. A dog's heart beats between 70 and 120 times a minute while a human heart beats 70 to 80 times a minute
  • A dog’s normal body temperature is 100.5 - 102.5˚ F
  • Dogs can't see in color as vividly as humans can
  • The world’s smartest dogs are said to be the border collie, the poodle, and the golden retriever.
  • A dog's sense of smell is more than 100,000 times more powerful than a human sense of smell
  • A dog's hearing is more than 10 times more powerful that that of a humans
  • The reason dogs don't like rain is because the sound is amplified to them and can hurt their very sensitive ears.
  • Between four and seven months old, puppies acquire a full mouth of permanent teeth
  • Small dogs live the longest out of all the different breeds. Toy breeds can live up to 16 years or more. The average age expectancy for large dogs are between 7 and 12 years.
  • It is believed that people who own pets live longer, have less stress, and have fewer heart attacks.
  • A dog’s whiskers (also called vibrissae) are touch-sensitive hairs and are located on a dog's muzzle, above the eyes and below the jaws, and can actually sense tiny changes in airflow.
  • Dogs have more than 220 million smell-detecting cells, about 215 million more than humans. The part of the brain interpreti smell is also four times larger in dogs than in humans.