Buck takes over as leader. (It’s not really that simple, there’s a lot of establishing his dominance in front of the men and convincing them that he’s the right dog for the job.)
It turns out that he’s even better than Spitz, and the team prospers as much as a starving pack of dogs in the frozen North can prosper.
Buck and the dogs are handed over to new masters, François and Perrault exit. In a sort of philosophical realization that everything is transient, Buck wonders at how men seem to pass in and out of his life.
Buck starts dreaming a peculiar recurring dream in which he goes back in time and sees himself sitting at the feet of a primitive man. Basically, he’s getting in touch with his primitive side of hunting, killing, and hanging out in caves.
Life is rough for quite a while.
Then Dave, another one of the dogs, gets sick, but refuses to leave his place at the sled. Dave soon dies nobly.