How does Buck demonstrate loyalty to his masters?

Buck demonstrates loyalty to his masters primarily through the formation of emotional bonds and protective instincts. This loyalty is rooted in his evolution from a domesticated pet to a wild creature, where he retains a deep sense of connection and duty toward those he considers his pack or family. Throughout the narrative, Buck shows this loyalty in various ways. For example, he takes risks to protect John Thornton, his final master, showcasing a strong emotional tie that motivates him to defend and support Thornton fiercely.

In contrast, while obedience without question might seem like loyalty, true loyalty encompasses deeper emotional connections that go beyond mere submission. Challenging authority can also arise from loyalty in certain contexts but is not a demonstration of loyalty; rather, it can indicate a struggle for dominance or respect. Avoiding interaction would imply detachment or disconnection, which is not indicative of loyalty. The essence of Buck's loyalty shines through his actions that reflect both a bond with his masters and a willingness to protect and serve them in times of danger.