I've got about 20 two star wolves. It started with just one (and a 1 star). I dug a pit next to a cozy shack I built in the mountains. I think I had 5 single meats in the pit, I just sat in my shack (next to the pit) and watched youtube videos till I heard the "wolf has been tamed" chime.

Once they are tamed I just fill the pit and the wolf rises up with the dirt. Once I had 2, two stars I just killed the 1 star. Its been nothing but 2 stars ever since.