 The Sabino 1 gene, and the associated spotting pattern, is found in Miniature horses, American Quarter Horses, American Paint Horses, Tennessee Walkers, Missouri Fox Trotters, Mustangs, Shetland Ponies, and Aztecas.SB1 is notably absent from the Arabian horse, Thoroughbred, Standardbred horse, Shire horse and Clydesdale.There are many proposed genes responsible for the sabino-like white spotting in these and other breeds.