Minecraft wiki entry for HorseChested, associated text:  ChestedHorse: 1 or 0 (true/false) - true if the horse has chests. A chested horse that is not a donkey or a mule crashes the game.
 Items: List of items. Only exists if ChestedHorse is true.
An item, including the Slot tag. Slots are numbered 2 to 16 for donkeys and mules, and none exist for all other horses.
Tags common to all items[show]