Buck is the "Ghost Dog," who torments the Yeehat Indians after they slaughter his beloved owner, John Thorton. In the last chapter of the story, the Yeehat Indians murder Buck's master, John Thorton, and he responds by wreaking havoc on the entire tribe. Following the death of his master, Buck abides the call of the wild and enters the wilderness, where he defeats a pack of savage wolves. Buck allows his primitive instincts to flourish as he becomes the leader of the pack and the Yeehats begin to notice a change in the breed of timber wolves, which now have splashes of brown on their head and muzzle with a rift of white centering down their chest. They also notice the presence of a Ghost Dog, which has extraordinary cunning and stealth. The Ghost Dog steals from their camps, ambushes their hunters, robs their traps, and slays their dogs. The Ghost Dog is virtually undetectable and defies even their best hunters. Overall, Buck is the enigmatic Ghost Dog, who has become legendary for terrorizing the Yeehat tribe and ruling the surrounding wilderness.