The American Indian Horse has a diverse background; in fact, it is really a collection of various breeds. According to experts, the first batch of American Indian Horses came to America with the Spanish Conquistadors in the 16th century. It wasn’t until 1961, that the American Indian Horse Registry (a repository of the records, lineage, and pedigrees of American Indian Horses) was established.
There are five distinct classifications to the American Indian Horse breed — Class 0, AA, A, M, and P — each of which is judged by the degree that the horse conforms to current standards. The purest bloodlines belong to Class 0, direct descendants of the original horses used by American Indian tribes. This class of horse is maintained for the purpose of preserving the Native American Indian Horse.