Which character represents a strong bond with Buck before his tragic end?

John Thornton represents a strong bond with Buck before his tragic end because he embodies the qualities of compassion, loyalty, and respect that ultimately create a deep connection between the two. When Buck is rescued by Thornton after a harsh and brutal experience, he experiences genuine love and care for the first time since his life was turned upside down. Thornton values Buck not just as a sled dog but as a companion and partner. Their relationship is characterized by mutual trust and admiration, and Buck finds joy and purpose in serving Thornton, which highlights the depth of their bond.

Throughout their time together, Thornton demonstrates kindness and empathy, contrasting sharply with Buck's previous experiences with less caring owners. This relationship is pivotal in Buck's journey, as it allows him to rediscover his instincts and true nature, fostering loyalty that leads Buck to perform extraordinary feats for Thornton. Thornton's tragic end, occurring as a result of the conflict with the Yeehat tribe, serves to underscore the loyalty and love that Buck has for him, making this bond all the more poignant and impactful in the story.