Wolf

Wolves are new mobs set to appear in Beta 1.4. Notch has confirmed the addition of these animals upon having breakfast with Peter Molyneux. On March 18th, 2011, a video was posted showing a preview of wolves, which are being made by Jeb. Wolves will spawn in forest and taiga biomes. Wolves can swim, and will shake water droplets off of their bodies when exiting water. Wild wolves are usually neutral. Wolves may also be considered the "pet dogs" as previously mentioned by Notch.

Taming
They are said to be rather rare, but they will not despawn once tamed. To tame a wolf, you have to feed it bones until a puff of heart particles appears and it gains a red collar, which indicates that the wolf has been tamed. The number of bones required is random.

Once tamed, they will become friendly. They will now protect you, and will attack mobs that you have attacked in melee. Tamed wolves will not attack mobs that you hit with arrows. In their current developmental state mobs will not attack your wolf (May change in beta 1.4). A wolf's tail will rise and lower depending on its health

Trivia

 * Tamed wolves will have a small red band around their neck, resembling a collar.