Adorable Miniature Horse in the zoo Seoul Grand Park in Korea

Miniature horses are found in many nations, particularly in Europe and the Americas. The designation of miniature horse is determined by the height of the animal, which, depending on the particular breed registry involved, is usually less than 34–38 inches (86–97 cm) as measured at the last hairs of the mane, which are found at the withers. While miniature horses are the size of a very small pony, many retain horse characteristics and are considered "horses" by their respective registries. They have various colors and coat patterns.

Miniature horses are friendly and interact well with people. For this reason they are often kept as family pets, though they still retain natural horse behavior, including a natural fight or flight instinct, and must be treated like an equine, even if they primarily serve as a companion animal. They are also trained as service animals, akin to assistance dogs for people with disabilities. Miniature horses are also trained for driving, equine agility, and other competitive horse show type events.