How Do Horses and Ponies Differ?

A horse is, well, a horse—except when it's not. Horses and ponies belong to the same species, Equus caballus. They share numerous traits, including their ability to be ridden, driven, and adored as cherished pets. Both have significantly impacted human history, from aiding in agriculture and industry to playing key roles in wars and battles.

However, they're not exactly the same. As any farm enthusiast will point out, the primary distinction between a horse and a pony lies in height. Horses are measured in hands—one hand equals 4 inches. An equine standing at 14 hands, 2 inches at the withers (the ridge between their shoulder blades) is classified as a horse. Those below this height are considered ponies.

"The height of an individual horse or pony ultimately decides whether it's categorized as a horse or pony, independent of breed names or traditional expectations," says Emily Thomas, museum assistant at the International Museum of the Horse in Lexington, Kentucky, in an email to Mytour.

Despite the clear height distinction, how people categorize certain horses and ponies can be a bit ambiguous. This is where things get murkier than a muddy paddock. Take the Arabian Horse, for example: According to the Arabian Horse Association, this graceful breed typically stands between 14.1 and 15.1 hands, although some individuals may be shorter or taller than the average [PDF]. This means some Arabian Horses are technically pony-sized, even though they’re generally still referred to as horses. Then there’s the Connemara Pony, which, despite being considered a pony, has an average height between 13 and 15 hands.

Miniature horses represent one of the trickiest cases. The American Miniature Horse Association only registers minis under 34 inches (because they’re so small, they’re measured in inches rather than hands). Yet, despite their compact size, these miniature equines are still classified as horses instead of ponies. This is because, as Horse Illustrated explains, a breed's conformation can impact whether it’s labeled a horse or pony. Miniatures were bred to resemble their larger counterparts, just on a much smaller scale, almost as if they’ve been shrunk down in the evolutionary dryer.

Tradition can also influence whether an animal is called a horse or a pony. The Icelandic Horse, with an average height of 13 to 14 hands and a sturdier build, is still classified as a horse by breeders and registries. This is not only due to the breed’s strength and ability to carry weight, but also because the Viking-era breed has always been known as a horse. As Élise Rousseau explains in Horses of the World, in areas with shorter breeds, the concept of a pony doesn’t even exist—equines of all sizes are simply called horses there.

Tradition is also why all polo horses are referred to as ponies. As The Horse Rider's Journal notes, the Manipuri Pony from India was once considered the original polo breed. However, today, multiple breeds are used for polo, yet all polo mounts—regardless of their size or breed—are still called ponies.

Essentially, figuring out when to call an animal a horse or a pony can be as complicated as deciding on a name. One thing a pony definitely isn’t, however, is a baby horse—that’s a foal. People might refer to their full-grown horse as a pony in the same way a dog owner might affectionately call their adult dog a puppy, but it’s more of a term of endearment than an indication of age.