After being in constant hunger for many days, Buck's old instinct to kill and eat raw meat and warm blood is rekindled within him. About this same time, Buck is constantly pitted against another powerful dog, Spitz, the lead dog of his sled team. After several skirmishes with Spitz, Buck's decisive fight with him occurs, and the result of the fight is a victory for Buck, who then becomes the lead dog. In his position of leadership