Law of the Wolf
Law of the Wolf is a 1939 American Western film directed by Raymond K. Johnson and featuring Rin Tin Tin III, Dennis Moore and Luana Walters. The film is was later reissued in 1941 with the alternative title of Law of the Wild It is not to be confused with "The Law of the Wild", a 1934 serial starring Rin Tin Tin, Jr. Plot. After being falsely accused of his brother Harry's murder Carl Pearson escapes from prison with the aid of another prisoner Duke Williams. Meanwhile, wealthy aircraft manufacturer Roger Morgan makes plans to  adopt Harry's son Bobby who is currently in the care of Ruth Adams, who is also Carl's fiancee. With his father dead young Bobby is the legal owner of valuable aircraft plans that Morgan wants to acquire. Carl's son is Johnny who is the owner of Rinty a prize tracking dog. The Police borrow Rinty in order to try to track Carl and Duke; but Rinty is less than cooperative in this effort. After a car accident leaves Ruth temporarily incapacitated, young Bobby wanders off. A canoe rescue and an encounter with a wild cougar follow. Arriving  at the Pearson's cabin Carl recovers the plans, but Duke steals them in order to sell them. Eventually everyone else ends up at the cabin and the real killer is revealed. The killer tries to escape followed by Carl and Rinty in a climactic chase.