Minecraft has now moved up to version 1.4 - adding wolves, which are tameable. That's it! [Snaps copy of Nintendogs+cats in half, and stomps all over 3DS]I'm playing Minecraft again.
The wolves are initially neutral and will not attack, but if you continue to feed them bones they will follow you and help you out. Here is a handy tutorial on how to tame those cute little buggers.
You can check another vid of the Wolves in action. Fun fact: when they get out of the water they shake, and it's adorable.