Wolf

Wolves are a planned mob. Notch has stated that they are going to be a definite addition and will also have the ability to be tamed to provide Pet Dogs. Notch has confirmed the addition of these animals upon having breakfast with Peter Molyneux, along with confirming Dogs, as said on his blog.

According to his twitter, Jens is currently working on a wolf mob for the game.

NOTE: Though there are wolves available with the Mo'Creatures mod, this is not the same.