In The Call of the Wild, what proof does the novel give that Buck will survive?
After John Thornton is killed and Buck gets his revenge against the Yeehats who killed him, Buck joins up with wolves. In a few years, the Yeehats notice some of the wolves have the same markings as Buck, so they must be his pups. Also, there's a story about a "ghost dog" that runs wild through the forest at the head of a pack of wolves. Buck becomes a legendary dog.