The Whippet (also English Whippet or Snap dog) is a dog breed of medium-size. They are a sighthound breed that originated in England, where they descended from greyhounds. Whippets today still strongly resemble a smaller greyhound. Shown in the Hound group, Whippets have relatively few health problems other than arrhythmia. Whippets also participate in dog sports such as lure coursing, agility, and flyball. The name is derived from an early 17th-century word, now obsolete, meaning to "move briskly".

Whippets were originally greyhounds that were deemed unsuitable for hunting because of their size. They were returned to their peasant breeders after being maimed so that they could not be used to hunt and break the forest law. These maimed dogs were bred together and used to catch rats, and hunt rabbits. When the forest law was repealed, these "miniature greyhounds" became popular in the sport of dog racing. This has led to Whippets being described as "the poor man's racehorse." They are still frequently used as racing dogs today, as they have the highest running speed of breeds their weight: 40 miles per hour and even challenge greyhounds for top speed. Whippets are, however, the fastest accelerating dog in the world.

Whippets are a medium-sized dog weighing from 25 to 42 pounds. There are two height ranges for Whippets, depending on whether or not the dog is being shown in North America. The Fédération Cynologique Internationale and The Kennel Club both call for heights of 18.5 to 20 inches for males and 17.5 to 18.5 inches for females. Because color is considered immaterial in judging Whippets, they come in a wide variety of colors and marking patterns, everything from solid black to solid white, with red, fawn, brindle, blue, or cream. The coat is short, smooth and close.

They are the fastest dog of their weight, capable of achieving speeds of 35 miles per hour. This is due to their unique way of running, which is referred to as a double suspension gallop. This gait results in four of the dog's legs being off the ground twice in each stride, once when the legs are completely extended and again when they are tucked under the body.
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Whippets are quiet and not prone to barking, but require regular exercise. They are generally gentle dogs and may be content to spend much of the day resting. The AKC describes them as "quiet and dignified in their owner's living room" and says they make "excellent house dogs." Whippets have been called a "poor man's racehorse" by the colliers in Lancashire and Yorkshire.

Despite being bred for racing, Whippets can be couch potatoes. When not running around, they are usually asleep or cuddled in their owner's lap. They are not prone to fighting but have been known to chase small pets, due to their sighthound nature. They also have a tendency to get up on furniture. Whippets are touch sensitive, meaning that they tend to jump or overreact when touched unexpectedly.