How does Buck feel after the events of Chapter 3? What has changed in his life over Chapter 3? Be specific in describing his feelings.

Buck feels that he is finally and rightfully alpha dog. Francois understands what has happened when Spitz doesn't appear in camp the next morning. As the men make ready to harness the dogs, Buck steps into the place Spitz had previously occupied. Francois tries to put more experienced sled dog in that position, but Buck refuses to join the team until the man relents and harnesses him in the leader's spot.