The Miniature Horse—often affectionately called "Mini"—represents a height breed rather than a distinct breed developed from single foundation stock. These tiny equines have been selectively bred from various pony and small horse breeds to produce animals displaying the proportions and characteristics of full-sized horses in dramatically reduced stature. Though genetically more similar to ponies, they are deliberately bred to avoid the stocky, cobby proportions typical of pony breeds.
Two major registries govern the breed in the United States. The American Miniature Horse Association (AMHA), founded in 1978 in Arlington, Texas, registers only horses measuring 34 inches or less at the last hairs of the mane. The registry closed in 1987, accepting only offspring of AMHA-registered parents thereafter. The American Miniature Horse Registry (AMHR), a division of the American Shetland Pony Club established in 1972, maintains two divisions: Division A for horses 34 inches and under, and Division B for horses between 34 and 38 inches.
Internationally, several other registries and breed societies recognize Miniature Horses, including organizations in Europe, Australia, and South Africa. The South African Miniature Horse, developed since 1945, represents a distinct population with its own breed society and studbook. The Falabella of Argentina, while sometimes confused with Miniature Horses, constitutes a separate breed with its own registry and bloodlines.
The term "Miniature Horse" specifically denotes horses bred to display horse-like rather than pony-like characteristics. Breed standards emphasize refined, well-proportioned conformation resembling scaled-down versions of full-sized light horses. This distinguishes them from simply "small ponies," though the genetic distinction between horses and ponies is negligible.
