the racing of greyhounds around an enclosed track in pursuit of an electrically controlled and propelled mechanical hare (rabbit). Dog racing is a 20th-century outgrowth of the older sport of coursing (q.v.), in which dogs hunted by sight rather than scent.

O.P. Smith demonstrated dog racing in 1919 at Emeryville, Calif., and the first track opened there that year. The sport was introduced in England in 1926 and became more popular there than in the United (United Kingdom) States. Dog racing later spread to such other countries as Ireland, Belgium, and Mexico.

In England there are normally eight races to a meeting. The National Greyhound Racing Club (founded 1928), the governing body, established race distances for flat and hurdle races from 230 to 1,200 yards (210 to 1,100 m). Usually no more than six greyhounds run in a race, which is run on grass. Most races are held at night under lights.

In the United States, dog racing started in California, but the sport had spread as far east as Florida by the mid-1920s. By the 1990s dog racing was a popular pastime in many states. Dog racing in the United States is under the supervision of state commissions. Eight dogs compete in each race, and there may be 10 or 11 races to a program. Dog tracks in the United States are made of sand and loam and are normally ¹/₄ mile (400 m), most races being at ⁵/₁₆ or ³/₈ mile. Betting, an essential feature of dog racing in most countries, is by the pari-mutuel (totalizator) system.