Riwoche

Horse

The Riwoche horse is a very small horse, discovered in an isolated region of Tibet in 1995. Previously unknown to science, these small animals may be an evolutionary link between the prehistoric wild horse and the modern domestic horse, though it could also be a domesticated variety that reverted to a small size and primitive coloring. They are pony-sized and dun in color.

http://en.wikipedia.org/wiki/Riwoche_horse