I second what has been said on collars and training. My pyr is only really good with a pinch collar on. My wolfhound is great with a choke chain, as long as I keep it directly behind his ears. My tibetan and Caucasian are great with regular collars, as they don't typically pull.
As far as the fighting, they are going to have to work out their own hierarchy. My guys are now working on this as well and the blood, cuts, scrapes, and punture wounds are painful for me to see, but they are animals and this is what they do. Once they work it out, you should be home free, it may just take them a while to resolve it. Max and Jake have been tussling quite a bit lately, as they are both just over 2 years of age now. Cody is undisputed alpha, but they are working on settling the number 2 and 3 spots. Chichi, being the only female doesn't really fit into their struggle. She is only submissive to Cody and now that she is turning 2, that is not as obvious as it used to be. She wants alpha, but doesn't have the nerve to really push for it yet. She is trying to work up to it, but isn't quite there. Just give your guys some time and they will sort it out for themselves.
Kathy