The Mountain Pleasure Horse has been known by several names throughout its history. For generations, eastern Kentuckians called their smooth-gaited horses "Kentucky Saddlers," "Old Kentucky Saddlers," "Country Saddle Horses," or simply "Mountain Horses." The designation "Mountain Pleasure Horse" became formalized with the establishment of the breed registry in 1989.
The Mountain Pleasure Horse Association (MPHA), headquartered in Mount Olivet, Kentucky, maintains the official registry and promotes the breed. This was the first mountain horse breed association to require blood-typing (now DNA testing) as proof of parentage for registration, establishing rigorous standards for breed authentication.
On September 29, 1994, Kentucky Governor Brereton C. Jones issued an official proclamation recognizing the Mountain Pleasure Horse. The proclamation acknowledged that research by the University of Kentucky found these horses to be the parent stock of all other American gaited horse breeds, a finding of considerable historical and genetic significance.
Due to their genetic importance and critically small numbers, the Equus Survival Trust has placed the Mountain Pleasure Horse on their watch list with a "critical" status. Approximately 3,000 horses have been registered since the association's founding, making conservation a priority for breed enthusiasts.
Some Mountain Pleasure Horses are double registered with the Rocky Mountain Horse Association and many are registered with the Kentucky Mountain Saddle Horse Association (KMSHA). Key differences exist between these registries: the MPHA maintains a closed studbook with purebred and appendix divisions, while fewer than 17 percent of MPHA foundation horses carry any trace of the famous Tobe bloodline that founded the Rocky Mountain Horse.

