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 was required before putting a horse saddle on it.

When horse saddles were placed on a donkey, a chest could be placed for on-the-go storage. However, the chest was inaccessible until after saddles were removed.

Horse saddle items were later removed from the game, and the same saddles (found in dungeons) are now used for both pigs and horses. (Taming a horse is still required before putting a saddle on it.)

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

Note: only fully grown horses could wear the saddles.