The Call of the Wild by Jack London

This triumphant tale of survival, the greatest of Jack London's works, relates the adventures of Buck, half-St. Bernard and half-Scottish sheepdog, who is forced into the brutal life of a sled-dog during the heady days of the Alaska gold rush.
Set in the harsh and unforgiving environment of the Far North, the story follows Buck as he grows daily in strength, savagery, and cunning, adapting to his hostile circumstances by responding to the stirring of his primitive ancestral traits.
This specially abridged edition for young readers, including six original illustrations, retains all the excitement of the original, and represents a fine introduction to the classic adventure novel.