How does Buck behave in his fight against Spitz?

In his fight against Spitz, Buck demonstrates a brutal and determined approach, showcasing his instinctual connection to the wild and his transformation into a powerful leader. The situation is charged with rivalry, as Spitz has been the dominant dog and represents an obstacle to Buck's rise in the pack hierarchy. Buck's behavior during the fight is characterized by an unwavering intent to defeat Spitz, using all of his strength and cunning. This represents Buck's evolution from a domesticated pet to a creature finely attuned to the primal rules of survival and dominance in the wilderness. His lack of mercy underscores the harsh realities of life in the wild, where only the strongest can survive and thrive. This context clearly illustrates why Buck fights without mercy, as he understands that relinquishing any advantage could result in his own demise.