What negative trait does Buck exhibit compared to the other dogs?

Buck's lack of a killer instinct is a significant negative trait in the context of the novel, as it highlights his initial development and adaptability to the harsh realities of life in the wild. When Buck first arrives in the unforgiving environment of the Yukon, he is more domesticated compared to the other dogs, who have been raised to be fierce and survival-oriented.

This inability to instinctively fight or assert himself could make him vulnerable in situations where strength and aggression are required for survival. As the story progresses, Buck's journey is largely about awakening these primal instincts within him, leading to growth and transformation. His early lack of aggression is contrasted with the more aggressive nature of other dogs, illustrating a key aspect of Buck's character arc and his gradual adaptation to his new environment. Ultimately, this trait serves to set the stage for his evolution as he learns that in the wild, the ability to assert dominance is essential for survival and success.