This lone wolf is like the wild counterpart to our boy Buck. When the two form a close friendship, it’s about Buck’s deeper longing to join the wild. The lone wolf enters the text at a point where we can see Buck’s raging inner turmoil. He wants to hang out with the wolf, but he is also loyal to Thornton. Then he wants to be feral and kill things, but he still loves the man and can’t leave him behind. It seems like all of the desires that Buck is feeling get thrown together in this lone wolf.