Among dogs officially registered with kennel clubs in the U.S., Labrador Retrievers are the most popular breed followed by Rottweilers and German Shepherds.

All dogs, regardless of breed, are direct descendants of wolves and technically of the same species.

A dog's whiskers -- found on the muzzle, above the eyes and below the jaws -- are technically known as vibrissae. They are touch-sensitive hairs than actually sense minute changes in airflow.

Dogs are capable of locating the source of a sound in 6/100ths of a second by using their swiveling ears like radar dishes.

Dogs have a sense of smell that is one of the keenest in nature. Humans might smell a pot of stew cooking on the stove, but a dog can distinguish the smells of each individual ingredient, from the beef itself to the potatoes.

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