The Call of the Wild by Jack London

Buck, the main character, is a 145lb Saint Bernard/Scotch Shepherd cross, which gives him the appearance of an exceptionally large dog that looks similar to a wolf. Buck leads a comfortable life as the pet of Judge Miller in the 'sun-kissed' Santa Clara Valley of Northern California. Judge Miller's gardener's assistant, Manuel, along with a friend, abducts the dog and sells him to a trainer of sled dogs, which were in great demand due to the discovery of "a yellow metal" in the frozen lands of the Yukon, Alaska. Slowly introduced to the brutality of his new life, Buck is forced to survive and adapt to conditions in Alaska and the Yukon. He works pulling sleds with other dogs, learns to steal food, and engages in power struggle with other dogs for the lead position in the sled team. His owners soon learn that even though his enemy, Spitz, fights like a devil, Buck is "two devils". He becomes the leader of the sled team after defeating Spitz in a battle. He then is exchanged to a mail carrier. He changes hands to a trio of incompetent owners, and is nearly starved and beaten to death. Eventually acquired by a kind and loving owner, John Thornton. When Thornton is killed by "Yeehat" native Americans, Buck goes into a beastly rage and kills several members of the native tribe. Buck returns to the wild and becomes the alpha male of a wolf pack he met a few days before the death of Thornton. Of the world Buck enters, London writes "the salient thing of this other world seemed fear." It is a world of dream that Buck enters, when he becomes something of a legend, The Ghost Dog.