Registries also are considered the authority as to whether a given breed is listed as a "horse" or a "pony". There are also a number of "color breed", sport horse, and gaited horse registries for horses with various phenotypes or other traits, which admit any animal fitting a given set of physical characteristics, even if there is little or no evidence of the trait being a true-breeding characteristic. Other recording entities or specialty organizations may recognize horses from multiple breeds, thus, for the purposes of this article, such animals are classified as a "type" rather than a "breed".
The breeds and types listed here are those that already have a Wikipedia article. For a more extensive list, see the List of all horse breeds in DAD-IS.
Horses are members of Equus ferus caballus that generally mature to be 14.2 hands (58 inches (150 cm)) or taller, but many breed registries do accept animals under this height and classify them as "horses," as horse characteristics include factors other than height. For the purposes of this page, if a breed registry or stud book classifies the breed as a horse, it is listed here as a horse, even if some representatives are pony-sized or have some pony characteristics. Pony breeds are listed in the next section, below.
Ponies are typically classified as members of Equus caballus that mature at less than 14.2 hands (58 inches, 147 cm). However, some pony breeds may occasionally have individuals who mature over 14.2 but retain all other breed characteristics. Also, some organizations use a different measurement cutoff to distinguish horses and ponies. There are some breeds once classified as ponies that now frequently mature over 14.2 hands due to modern nutrition and management, yet retain the historic classification. For the purposes of this list, if a breed registry classifies the breed as a "pony," it is listed here as such, even if some individuals have horse characteristics. Otherwise, where there is a dispute as to "horse" or "pony" status of a breed, "horse" is the default.
(Because of this designation by the preference of a given breed registry, most miniature horse breeds are listed as "horses," not ponies.)