What emotional bond is portrayed between Buck and John Thornton?

The emotional bond between Buck and John Thornton is characterized by love and mutual respect, which represents a significant turning point in Buck's journey throughout the novel. After enduring harsh treatment from previous owners, Buck finds a deep connection with Thornton, who treats him with kindness and empathy. This relationship is built on reciprocity; Buck's loyalty and affection for Thornton grow as he experiences the safety and affection Thornton provides.

Thornton respects Buck not just as a pet or a tool, but as a being with feelings and a spirit. This mutual regard is evident in the way Buck responds to Thornton’s care, performing feats to prove his dedication and affection, such as saving Thornton from drowning. This bond reflects a profound understanding between the two characters, showcasing the themes of love and respect amidst the backdrop of survival and instinct that permeate the narrative.

In contrast, the other options depict relationships that do not align with the dynamics observed in Buck and Thornton's connection. Dependency and obligation suggest a one-sided relationship primarily based on need, while superiority and submission imply a power imbalance that is absent between them. Rivalry and competition do not apply, as their relationship is characterized by collaboration and support rather than conflict.