Registration
The ApHC states that the Appaloosa is "a breed defined by ApHC bloodline requirements and preferred characteristics, including coat pattern." In other words, the ApHC considers the Appaloosa as a distinct breed from limited bloodlines with distinct physical traits and a desired color. Thus, Appaloosas are not strictly a "color breed." All ApHC-registered Appaloosas must be the offspring of two registered Appaloosa parents or a registered Appaloosa and a horse from another approved breed registry. The ApHC lists Arabian horses, Quarter Horses, and Thoroughbreds as approved breeds. In all cases, one parent must always be a regular registered Appaloosa. The only exception to the bloodline requirements is in the case of Appaloosa colored geldings or spayed mares with unknown pedigrees; owners may apply for "hardship registration" for these non-breeding horses.
Read more about this topic: Appaloosa Horse Club