Why does Buck ultimately choose the wild over human companionship?

Buck ultimately chooses the wild over human companionship because he feels a deeper connection to the wild that fulfills his instincts and desires. Throughout "The Call of the Wild," Buck undergoes a transformation that reconnects him with his instincts as a wolf. As he faces the harsh realities of life in the wilderness, he discovers that his true nature aligns with the primal call of the wild.

This choice symbolizes Buck’s journey of self-discovery and personal growth. As he encounters the challenges of survival, he learns to listen to the instincts that have been dormant within him due to domestication. This connection to the wild not only provides him with the freedom to embrace his natural abilities but also brings him a sense of belonging that he didn’t find in his human interactions. Ultimately, Buck's choice represents a return to his ancestral roots, where he finds fulfillment and a sense of purpose that human companionship could not offer.