When Aang, Katara, and Sokka visited Omashu to do some sightseeing, the Avatar brought his friends on a ride down the city's delivery system. Once the cart had fallen off the rails and ruined countless buildings, a bearded cat jumped into Aang's wig which he had been using as a disguise, where the animal encountered Momo. The two animals fought with each other for a moment before the lemur pushed it out of the cart.
Aang later met another cat named Miyuki who was owned by a senile old woman. He had hoped that visiting the herbalist's medical institute might heed some sort of cure for Katara and Sokka's ailments, both of whom had caught a cold from a storm the day before. The herbalist boasted of her cat, Miyuki, who had grown to be ninety-seven in human years. Miyuki was alongside her owner when Zuko, Iroh, and June were led to the institute by Nyla, June's shirshu.
Fluffykins was a cat who resided in Ba Sing Se with a family. When Aang created a new zoo with his bending to replace the old, inhospitable one, Kenji, the zookeeper, complimented the Avatar on his accomplishment and suggested that he make a career for himself working with animals. Kenji quickly retracted this opinion, however, when he overheard a few people, including Fluffykins' owners, finding their pets who had been mistakenly put in the zoo, as well. There was also a chubby white cat standing behind Fluffykins and next to a brown-furred dog, but it went unnamed.
The only cats that have been revealed were relatively small in comparison to other animals, and they vary greatly in type and color. Certain attributes that differ among cats are fur length and color, eye color, and body shape. For example, bearded cats are set apart by shorter fur and their long, white muzzle fur, taking the appearance of a beard.
Only domesticated cats have been seen throughout Team Avatar's journeys. The bearded cat was quite hostile, although this may have only been because it felt provoked by Momo. Miyuki was quite calm in all appearances, and Fluffykins did not have enough personality development to be distinguished, the same situation being for the unnamed white cat.
There is only one known animal that the cat has hybridized with, the owl, to form a cat owl chimera. Cat owls have been seen in the wild as well as domesticated, unlike the cat which has only been seen as a pet.