What trait insures that Buck will survive in the north? How is this aspect shown in the story? How would this trait be accepted in his former life? What does this say about the differences in the two worlds?

Buck has inner strength and leadership. Buck is tenacious and assertive. In his former life, these traits would be aggressive and discouraged. There were kids around and Buck was merely a pampered pet. Although Buck's new world is much harsher than his old world, it also suits Buck better. Buck is beginning to discover his inner strength and purpose. In California, Buck was docile and submissive.