Minecraft Dungeons:Horse

The Horse is a mob-like object $$ that exclusively spawns in the Lone Fortress inside a secret room. It cannot be ridden unlike the horses from the base game and comes pre-equipped with a Saddle and a Chest as seen in the textures, the latter of which cannot be equipped onto horses in the base game.

Trivia

 * It uses the old horse model before Update Aquatic in the base game.
 * Despite being a mob in game, it cannot be interacted with in any way and it isn't even able to move.
 * It also doesn't have sounds in-game, though it does in the game files.