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 may also be considered the "pet dogs" as previously mentioned by Notch. Wild wolves are usually neutral. As of now, they are not known to drop anything, nor is it known how much health they have.

Taming
They are said to be rather rare, but they will not despawn once tamed. To tame a wolf, you have to give 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. You can tame more than one wolf.

Once given enough bones, they will become friendly. They will now protect you, follow you around, and will attack mobs that you have melee'd. 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, and it can be restored with raw pork (and posssibly other foods).

Trivia

 * Tamed wolves will have a small red band around their neck, resembling a collar and a friendlier facial expression.
 * Wolves will turn their head to the side and beg if the player is holding raw pork. This may happen with other kinds of food.
 * Wolves can swim, and will shake water droplets off of their bodies when exiting water.
 * Jeb has said that wolves may have color variations, but he "would have to run that through notch =)".