How does Buck's loyalty manifest during the story?

Buck's loyalty manifests prominently through his instinct to protect those he cares about, especially as he forms bonds with his human companions and other dogs. Throughout the story, we see Buck develop a strong connection with John Thornton, which ignites his deep sense of loyalty. This loyalty drives Buck to take risks and make sacrifices to ensure Thornton's well-being, highlighting how emotional connections can inspire courage and dedication.

In various situations, when Thornton is in danger, Buck’s protective nature comes to the forefront, demonstrating that his loyalty is not limited to mere obedience but extends to a profound commitment to those he forms attachments with. This ability to prioritize the safety and welfare of his loved ones showcases the evolution of Buck from a domesticated pet to a creature driven by instinct and loyalty, reflecting the central themes of the novel.