old gray horse.

agriculture albino anatomy black bloods bone breeds canter castrated chestnut cold colors colt domestication draft driving dun endurance entertainment feral filly foal forage gaits gallop gelding gray graying hair harness hide horse horses hot jog leopard locomotion lope mammal mare mares markings meat milk old outdoor pace palomino park pinto police ponies przewalski racing riding sabino saddle show sleep speed sport stallion standing therapy thoroughbred trot warfare white wild work yearling