A small, tough horse bred by Native Americans of the Pacific Northwest, or a similar small/inferior horse in general.
From Nez Percé or Cayuse people languages of the Pacific Northwest. The Cayuse people were renowned horse breeders, and the name transferred to the horse breed they developed and traded.
The Cayuse horse was the original American pony—tough enough to traverse rocky mountains and survive on sparse grass, before the mythical Wild West horses came along.
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