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The Andalusian is a Spanish horse. It is also called the Pure Spanish Horse, Purebred Spanish Horse, or Pura Raza Espanol (PRE) as it is referred to by Spanish breeders. It's ancestors include the primitive Sorraia horse, which around 900 B.C., was mixed with horses from Northern Africa.
Modern horses, zebras, and asses belong to the genus Equus, the only surviving genus in a once diverse family, the Equidae. Based on fossil records, the genus appears to have originated in North America about 4 million years ago and spread to Eurasia (presumably by crossing the Bering land bridge) 2 to 3 million years ago.