The Miniature Horse, developed in the 1950s as a smaller, conformationally correct version of larger horses, has grown in popularity due to its manageable size, diverse coat colors, and gentle temperament. The American Miniature Horse Registry (AMHR), established in the 1970s under the American Shetland Pony Club, registers these horses based on height divisions—up to 34 inches for Division A and 34 to 38 inches for Division B—with permanent registration granted at age six. Miniature Horses are valued not only for their space and feed efficiency but also for their versatility in showing, driving, and as therapy or service animals.

Owners appreciate Miniature Horses for their calm nature and ability to excel in various disciplines, including in-hand classes, driving, jumping, and trail events. The breed offers an accessible equine partner for those unable to keep larger horses, with a strong presence in competitive shows such as the AMHR National Championship, which attracts over 1,500 horses annually. While closely related to Shetland Ponies, Miniature Horses are distinguished primarily by their height-based registry rather than bloodline, allowing some overlap in registration if height criteria are met.