The Call of the Wild and White Fang by Jack London

The Call Of The Wild is the  story of Buck, a dog stolen from his home and thrust  into the merciless life of the Arctic north to  endure hardship, bitter cold, and the savage  lawlessness of man and beast. White Fang  is the adventure of an animal -- part dog, part  wolf --turned vicious by cruel abuse, then  transformed by the patience and affection of one man.

  Jack London's superb ability as a storyteller and  his uncanny understanding of animal and human  natures give these tales a striking vitality and  power, and have earned him a reputation as a  distinguished American writer.