This is my understanding. You can find cats in dc and uw (recommend looking b15 and down), you can tame them like dogs. You can change their skin to whatever costumes you have unlocked with mystery meat. If you don’t have any costumes unlocked you can change their skin color (white, black, yellow). To get mystery meat look through chests, or kill mind flayers/dogs/watchers. Dogs also have a new skin, feed your reg. dog mystery meat and it can change into the new skin.