An examination of the life and legacy of Rin Tin Tin, an orphaned German shepherd that was found on a World War I battlefield in France, taken home to California by a soldier, and made into a movie star.
Real-life stories explain how a border collie gathers sheep into a pen, well-trained dogs learn to track deer, a little dachshund forces a rabbit to run in a specific direction, and a scrappy Australian cattle dog herds a 1,000-pound bull.