Cat, that usually fucks up the few blocks I manage to get up because he wants to rub his head on the mousepad or under my hand EXACTLY then.
Dog (Rottweiler / German Shepherd mix), she grew up with c-rpg sounds and would probably sleep less well if I stopped playing.
Bunch of chicken, they are free and annoyingly curious and try to steal cookies out of your hand.
And a real lot of other creepers that live here on the land with us, like friendly green snakes and lotsa big fat spiders.