Call of the Wild

 The Call of the Wild by Jack London

A pampered dog is stolen from his home in the Santa Clara valley and sold to become an Alaskan sled dog. He becomes increasingly "wild" and becomes the leader of the pack, but remains loyal to good humans. He finds himself pulling the sled of some idiot humans who disregard advice from others and try to travel in luxury. Buck escapes from them just before they end up killing themselves. He befriends the man that helped him escape. After this man is killed by natives, Buck seeks revenge. After that, he has no more humans to be loyal to and answers the "call of the wild".  I liked this book a lot better than I did when I read it in school. The "dog narration" works well here. (I happened to read it and Socks, back to back to keep an animal narration scheme going.)