It contains a list of horse and pony breeds, and also includes terms used to describe types of horses that are not breeds but are commonly mistaken for breeds. A breed is defined generally as a viable true-breeding population, and its members are called "purebreds". In most cases, bloodlines of horse breeds are recorded with a breed registry. However, in horses, the concept is somewhat flexible, as open stud books are created for fairly new types of horses that are not yet fully true-breeding. 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.

Tags: Abaco Barb/Akhal-Teke/American Cream Draft/Andalusian/Appaloosa/Appendix Quarter /Arabian/Barb/Belgian/Budenny/Camargue/Canadian/Caspian/Chincoteague/Cleveland Bay/Clydesdale/Connemara Pony/Curly/Dales/Danish Warmblood/Dartmoor Pony/Dutch Warmblood/Exmoor/Fell Pony/Florida Cracker/Friesian/Gotland-Russ Pony/Gypsy/Hackney/Haflinger/Hanoverian/Highland Pony/Icelandic/Irish Draugh/Kathiawari/Kerry Bog Pony/Knabstrupper/Lipizzan/Lippitt Morgan/Lusitano/Mangalarga Marchador/Marsh Tacky/Marwari/Miniature/Missouri Fox Trotter/Morab/Morgan/Mountain Pleasure/Mule/Mustang/National Show/New Forest Pony/Newfoundland Pony/Nokota/Norman Cob/Norwegian Fjord/Oldenburg/Orlov Trotter/Paint/Paso Fino/Percheron/Peruvian/Pinto/Pony of the Americas/Przewalski/Quarter/Racking/Ranger/Rocky Mountain/Saddlebred/Selle Francais/Shagya Arabian/Shire/Spanish Mustang/Spotted Saddle/Standardbred/Suffolk Punch/Swedish Warmblood/Tennessee Walking/Thoroughbred/Trakehner/Welsh Pony and Cob/Westphalian/Buckskin/Palomino/Pinto/White/Black/Brown/Blonde/Spotted/