The story opens with Buck, a large and powerful St. Bernard-Scotch Shepherd, living happily in California's Santa Clara Valley as the pet of Judge Miller. He is stolen by the gardener's assistant, however, sold to fund the latter's gambling addiction, and shipped to Seattle. Put in a crate, he is starved and ill-treated. When released, he attacks the "man in the red sweater" but is badly beaten and taught to respect the "law of the club". Buck is then sold to a pair of French-Canadian dispatchers from the Canadian government, FranĂ§ois and Perrault, who take him with them to the Klondike region of Canada. There, they train him as a sled dog. From his teammates, he quickly learns to survive cold winter nights and the pack society. A rivalry develops between Buck and the vicious, quarrelsome lead dog, Spitz. Buck eventually beats Spitz in a fight "to the death". Spitz is killed by the pack after his defeat by Buck, and Buck eventually becomes the leader of the team.