Wolves can Be tamed with a bone. After taming you will get a pet Dog.
Once you get a Dog, you can make it sit by right clicking it. The Dog will always teleport to you as long as He is not sitting. If you punch any mob (Except Creepers) your Dog will go and kill it. To heal your dog after a fight, right click on it with Meat uncooked or Cooked.
If you come across a wolf pack, the wolves in the pack are netural mobs until you punch one. Then, the entire pack will try to kill you.