40d:Pet

Tame animals can be adopted as pets by dwarves. On the animals screen z-Animals, you can mark each animal as Available/Unavailable by selecting it and pressing Enter. Available large animals may be adopted by any dwarf, but tame vermin will only be adopted by dwarves who like that animal.

Tame animals that are not already pets are treated as livestock, and you can ready them for slaughter (at the butcher's shop) on the same screen. If a tame animal dies by any means other than slaughtering at a butcher's shop, it cannot be butchered, and its bones and skull cannot be used to make objects. Once an animal has been adopted as a pet, it will be given a name, and can no longer be slaughtered.

Cats are shown as "Uninterested", because cats choose their owners. They will not choose an owner if kept in a cage, although they might choose one in the midst of being transferred to the cage.^[Verify] Another way to keep the fort from being littered with pet cats is to turn them into +Kitten Tallow Biscuits+.

Dogs can be trained at the kennel as either war dogs or hunting dogs. Trained dogs can be assigned to a specific dwarf via that dwarf's preference menu (v-p-e, "Assign trained animal"). Trained dogs will follow their trainer around until they are assigned to someone else (or caged or chained).

Immigrants often arrive with one or more pet animals (limited to dogs, cats, horses, mules, or donkeys). The offspring of pets are always tame but not themselves pets. However, they will follow their mother's owner around until they are trained, become someone else's pet, or are caged or chained.

Advantages/disadvantages

• Unhappy dwarves can be "comforted by a pet" and become happier
• The pet will follow their owner everywhere, and cannot be caged or chained
• Death of a pet makes its owner unhappy, though less so than death of a friend or family member.
• Dead pets should be buried in a coffin, or the owner will be more upset.
• Pets can't be eaten unless the owner is dead (the animal keeps its name but is no longer a pet)

Effects on performance

Depending on the computer, having a lot of pets can make an impact on FPS. In this user's tests, a 100 dwarf fortress with wide open hallways for easy pathing was getting about 70 FPS average, with twenty pets. I used death hallways to kill fifteen of the pets (kept a few cats for vermin duty), and now get about 80 fps average. This seems like a huge jump, and no other fortress changes could be found to explain it.