How does Buck's relationship with John Thornton differ from his previous masters?

Buck's relationship with John Thornton represents a significant transformation from his previous experiences with masters. Unlike his earlier relationships, which involved elements of control and fear, neglect and indifference, or pure transactional exchange, Buck's bond with Thornton is characterized by mutual respect and affection.

This shift occurs because Thornton treats Buck with kindness and compassion, establishing a deep emotional connection. Thornton's actions—such as saving Buck from danger and recognizing his worth—help Buck realize that he can form a genuine bond with a human. This relationship contrasts sharply with those Buck had previously, where he was often treated as a mere tool for labor or subjected to harsh treatment. Thornton's understanding and respect for Buck instill in him a sense of loyalty and love, illustrating the profound impact a compassionate relationship can have on a once-wild creature.

Ultimately, this mutual respect and affection not only enhance Buck’s quality of life but also catalyze his transformation, affirming the importance of positive human-animal relationships.