A young boy saves a collie pup's life when his master is ready to move on and is about to shoot him. The pup is then free to roam the wilderness and must fight for existence along with the wolves. Acquiring wolfish ways, he is hunted throughout the range as the killer wolf. When the boy goes hunting for this killer wolf and stumbles upon the dog (now grown to adulthood) caught in a trap, he sets him free. The wolf-dog and the boy become friends, and when the boy falls into a trap, the dog fetches help. The searchers free the boy and are about to kill the dog but again the boy comes to his rescue, an act resulting in a permanent bond between man and beast.—AFI