The AMR accepts purebred Morgans, those horses registered with the American Morgan Horse Association, as well as the Canadian, British, Australian and Swedish Morgan Horse Associations, and horses who are certified to be Morgans by their owners and breeders. Outcrosses to any breed are acceptable. The typical Morgan stands between 14 and 15.2 hands, with a strong muscular body, substantial bone, and outstanding endurance. All colors are allowed. A Morgan has a good rapid walk, smooth canter, and excellent trot.
Gaits are athletic, smooth and flowing, with no tendency to wing or paddle.
Some purebred Morgans have an additional gait known as the single-foot, that is unsurpassed for extended rides in rough country.