Class - Mammalia
Order - Perissodactyla
This order is comprised of odd-toed hoofed mammals including horses, rhinos, and tapirs. In past geologic times its members were made more numerous and widespread than they are today.
Family - Equidae
This family contains seven species including horses, zebras, and wild asses.
Genus, Species - Equus Caballus
There are at least 111 recognized breeds of domesticated horses including thoroughbreds, Suffolks, quarterhorses, Arabians, and Clydesdales.