dog racing, trials of speed between dogs. Now contested on oval tracks, the sport developed from the ancient practice of coursing, in which specially trained dogs chase game animals in the open field. Whippets chased live rabbits until the protests of humane groups had the practice outlawed. Artificial hares, first tried in 1876 in England, eventually became standard and greyhounds, accustomed to hunting by sight and sound rather than by smell, replaced whippets. The sport became popular in the United States in the 1930s when some states permitted wagering. Dog tracks are popular in Florida, Massachusetts, and some western states as well as in England, Ireland, Australia, Spain, and Indonesia.

Sport of racing sleds pulled by dogs over snow-covered cross-country courses. It developed from a traditional Eskimo method of transportation. Modern sleds are usually of wood (ash) construction, with leather lashings and steel- or aluminum-covered runners. Sled dogs are usually Eskimo dogs, Siberian huskies, Samoyeds, or Alaskan malamutes; teams typically consist of 4–10 dogs. The course is usually 12–30 mi (19–48 km) long, though some, including the Iditarod, are considerably longer.

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