Glossary of Racing Terms
Jack spavin: See bone spavin.
jail: Refers to the requirement that a horse who has been claimed, who next runs in a claiming race--must run for a claiming price 25% higher for the next 30 days. Commonly used in the phrase "The horse is in/out of jail."
The Jockey Club: An organization dedicated to the improvement of Thoroughbred breeding and racing. The Jockey Club in North America was incorporated on February 10, 1894 in New York City. The Jockey Club serves as North America's Thoroughbred registry, responsible for the maintenance of The American Stud Book, a register of all Thoroughbreds foaled in the United States, Puerto Rico and Canada; and of all Thoroughbreds imported into those countries from jurisdictions that have a registry recognized by The Jockey Club and the International Stud Book Committee.
jockey fee: Sum paid to rider for competing in a race.
jockeys' race: A race the outcome of which will hinge mostly on strategic thinking by the riders; i.e., one in which riders must pay close attention to pace to keep their horses fresh for a strong finish.
jog: Slow, easy gait.
joint: 1) The hinge between two bones in the musculoskeletal system. 2) See battery.
joint capsule: The structure that comprises the boundary to the joint space.
jumper: A steeplechase or hurdle horse.
juvenile: Two-year-old horse of either gender.