Half SiblingsHorses out of the same dam but by different sires. Horses with the same sire and different dams are not considered half-siblings in Thoroughbred racing.
HalterLike a bridle, but lacking a bit. Used in handling horses around the stable and when they are not being ridden.
HandFour inches. A horse's height is measured in hands and inches from the top of the shoulder (withers) to the ground, e.g., 15.2 hands is 15 hands, 2 inches. Thoroughbreds typically range from 15 to 17 hands.
Hand RideUrging a horse with the hands and not using the whip.
Handicap1) Race for which the track handicapper assigns the weights to be carried. 2) To make selections on the basis of past performances.
Handily1) Working in the morning with maximum effort. Compare with, 2) A horse racing well within itself, with little exertion from the jockey.
HandleAmount of money wagered in the parimutuels on a race, a program, during a meeting or for a year.
HarrowImplement or unit with pulling teeth or tines used to rake and loosen the upper surface of a track.
HeadA margin between horses. One horse leading another by the length of its head.
Head of the StretchBeginning of the straight run to the finish line.