Rocky plot
One day while fishing, painter John Hammond and his son Chris come across Bert Hillman, the foreman of a local ranch. He and his farmhand are looking for a wild dog that killed one of their sheep. They find the animal and kill it, along with one of its puppies, but after leaving Hammond and his son, they discover another puppy still alive. They take it home and name it Rocky. John believes that a dog descended from sheepslayers will one day become a sheepslayer himself, but he gives his son the chance to raise and train the dog, hoping the killer instinct will disappear. Unfortunately, local farmers have reported an epidemic killing their sheep, and they suspect Rocky is responsible.