Buck, a domesticated dog, is thrust into the brutal reality of the Yukon wilderness where he must abandon his civilized instincts to survive. Stolen from his comfortable life in California, Buck is sold as a sled dog during the height of the Klondike Gold Rush. He faces harsh physical labor, cruel masters, and the primal competition of the pack. The narrative follows his internal transformation as he navigates the logical constraints of a world governed by the law of club and fang, eventually shedding his domestic identity to embrace his ancestral heritage.

Readers frequently highlight the visceral intensity of London's prose, which captures the unforgiving nature of the Yukon with remarkable clarity. Discussion often centers on the philosophical implications of Buck's transformation and whether the story serves as a critique of human civilization. Critics often point to the balance between the brutal action sequences and the introspective moments that define Buck's character development. The work remains a central point of analysis for those interested in naturalism and the intersection of animal instinct with human ambition.