Tips for keeping wolves:
Female wolves will fight. They will. Even if there is the same amount of males as females. They will. So keep them in pairs, until they get pregnant then you can move them to another spot if you want.Then they will stick to eachother. They all want to be with the dominant male (just find the one that always growls at others, or the first to get pregnant). If your female insists it wants that male instead of the new one, remove the female and the male you want her to breed with and put them in the same enclosure with no other wolves. Wait for the female to get pregnant. Males will sometimes fight eachother for females, or even sometimes because they feel like it (one male wolf killed five others, only three of the had mates). If you find a male who wants to fight everyone, DON'T RELEASE HIM IF HE HAS A MATE. This will bring choas. Instead, place him in a different exhibit, along with his mate. Wait for a couple months, and then put him in the regular enclosure. If he still wants to fight, release him and his mate. Male fighting is rarer than females fighting, so you could try keeping all males in an exhibit with no females(I haven't tried this, do at your own risk!!). If a female's mate dies, remove the female and put her in a seperate exhibit, and place another male (without a mate) or buy one. If she has puppies move them too. Hopefully this will reduce the amount of deaths caused by fighting (which most are, come to think of it).