Buck is sold off to Perrault and Francois. Buck becomes one of the many sled dogs and ends up killing the lead dog.
We'll buy Buck.
Road of trials.
Charles, Hal, and Mercedes are mistreated the dogs. That's when John Thornton rescue Buck from the mistreating. All the other dogs and the owners fought and died in the river. Buck realized that he wanted to be in the wild, not domesticated, even though he loved John
John knew that it was best for Buck to be in the Wild, so he let him leave.