Horse saddles

Horse saddles were items that were added along with horses that worked just like regular saddles, but for horses instead of pigs. Taming a horse is required before putting a saddle on it.

When horse saddles were placed on a donkey, a chest can be placed for on-the-go storage. However, the chest is currently inaccessible.

Jeb announced that horse saddle items will be removed. In the next snapshot (13w18a), horse saddles were removed from the game. The same saddles (found in dungeons) are now used for both pigs and horses.

Usage and behavior
Place a saddle on a tamed horse to be able to ride it. You can ride it by right clicking on the animal and using the regular control keys. When you are done, you can press the shift key to dismount. The horse will drop a worn saddle when killed.

Note: only fully grown horses can wear saddles.