You can BE a dancing cat in WoW, I was one for years! Also in ESO, though more of a cat/human there.
Now I'm trying to think of what MMO I played where they had the race with fox-tails and ears. I nade one of them and she was sooo cute. It's not Wildstar, maybe some Perfect World game? Was very asian-mmo feeling, really colorful too. Gah, what was that game, I really kinda liked it about five years ago.
Edit: D'oh, it was just Perfect World the game. Female "Untamed" race all had cute animal ears and tails.