In the golden age of Hollywood, audiences embraced heart-warming sagas about the journeys and bravery of man's best friends. Amongst these films, Border Collie Lassie, played by a male dog originally named Pal, and German Shepard Rin Tin Tin rose to the top as the most famous leading dogs in America. Though Rin Tin Tin had a bad boy reputation for his tendency to bite, Lassie proved to be the consummate good girl. This episode of Hollywood Rivals chronicles the pup actors, trainers, film makers, and Hollywood celebrities that contributed to the fame of these iconic furry heroes.