The Wolf is a passive mob in TFC. It behaves similarly to vanilla minecraft wolves. They deal slashing damage.
They can be familiarized by giving them bones until hearts start to appear. At this point it will follow the player, but not obey commands to sit or stand, and will still hunt livestock when hungry. They must be pet by shift-right clicking on them to further familiarize, and at high enough level a collar will appear, and then they will be obedient dogs. Disobedient dogs can still be forced to sit by leashing them onto a fence. Leashing will also calm the animal if it has been angered.
To feed wolves/dogs, feed them any meat except calamari. Feeding is used for breeding and to regenerate health.