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A horse of a strong, agile breed developed in the western United States to work with cattle, usually having a solid-colored coat.
[From its formerly being trained for races up to a quarter mile.]
(Horse Racing) a small powerful breed of horse, originally bred for sprinting in quarter-mile races in Virginia in the late 18th century
one of an American breed of strong, agile horses capable of great speed over short distances, often used in herding livestock.
[1825–35, Amer.; orig. bred for competition in short-distance races, usually a quarter of a mile]