Dornish sand steed

The Dornish Sand Steed is a unique breed of horse bred in Dorne, the southernmost region of Westeros with a primarily desert climate.

They are splendid beasts that can run for a day and a night without tiring. A knight wearing full metal plate armor would bake in the hot desert sun, so Dornishmen wear only light armor, and thus their horses are bred for extreme stamina instead of strength. Sand Steeds are therefore not intended for use as full war horses, as they cannot carry the weight of a fully armored rider, but for an unarmored traveler they make an excellent mount.