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John Thornton, Buck's brand-new owner, is different from other people. He's peaceful, caring, and Buck adores him for saving his life. I believe this is the first time throughout the book that Buck is happy and feels loved in a special way. During chapter 6, Buck learns about loyalty and something more than just the law of "club and fang." John and Buck create a new bond in which both appreciate and cares for one another. Buck loves John so much, he's afraid of losing him like his past owners. Since Thornton saved Buck's life, Buck has been always aware of him and has returned the favor several times. This is the only part in the book where Buck learns and gets stronger without need of hitting or suffering.