So, a few years ago I bought this leopard from an elven caravan, hoping that I could train it as a war animal and post it to guard the entrance to my fort. I saw later on the wiki that leopards are only trainable by the Dungeon Master, so that's not going to happen. So, what can I do with it? Let it wander around being awesome? Make some delicious leopard steaks?
Aside from breeding it for food (which would require you to acquire another animal of the opposite gender, obviously) and outright butchering like any other animal, and assuming without modding anything, your options are limited to: