Here are some useful links. I'm especially fond of AnimalDiversityWeb for all mammals. All these links are on gray wolves, but from them, you can find other pages within their sites for info on other mammals as well as the other species of wolves.
They are a very socail animal. Most of the behaviors in our dogs are the same of the wolf pack structure. If you understand the structure of a wolf pack, then you can understand and communicate with your dog better.
There is one domminate wolf-the alpha, and then there's also the scape goat they all like to pick on: The omega. Every pack's got one.
*When wolves lick at the muzzle of another wolve, it is a show of respect and subordination. Also, in pups, it is usually asking for them to regurgitate food.
*If a wolf raises it's paw as if to shake your hand, it is a sign of friendship. That is why most dogs learn the command "paw" or "shake" rather easily.
*If they roll over on their side, obviously it is showing subbordination. Allowing dominance.
*If a wolf makes eye contact and holds it with you or another wolf, it is making a challenge. Usually if both parties hold the eye contact, the wolf will begin snarling and growling. Then if the intimidation doesn't work, it will attack. If one party looks away, it's saying, "I don't want to fight right now." I've approached lots of dogs who saw me as a stranger and and intruder to there turf by just looking away from their eyes consistantly as I slowly approached while they challenged me. I look at them, then look right, then back, then left, then back; until they get the point that I'm not going to attack them. Usually they'll calm down a little, yet remain stiff and skepticle. That's when you allow them to sniff your hand until they get confortable with your scent. Then you can make friends.
I learned how to do this by reading about Wolf social behavior. That's the way wolves react also.