The reasons to use two dogs together are two fold. First you have twice the dog power. Second, if they have the instinct of good guardian dogs, one will become the "night dog" that patrols the peremiter during the night while the "day dog" rests and backs up the night dog. During the day they trade jobs/duties.
Wolves would be tough to guard against. I use some pretty tough Akbash dogs that have worked coyote, bobcat, feral dog, and lion country without a loss, but a pack of 3-4 wolves would be more than a pair could handle I'm afraid. Good Luck with them gcreek.