The Wolf Dog is a 1933 American Pre-Code Mascot film serial directed by Colbert Clark and Harry L. Fraser and starring Frankie Darro and Rin Tin Tin, Jr. The plot concerns a young boy becoming the heir to a fortune and a villain attempting to take it from him. The boy's canine pet, Rin Tin Tin Jr., is the star of the film, protecting his master from a succession of murder attempts.