Fearless (played by Fearless the Dog) is a protagonist in Doc's Dog.
J. Nelson Summers M.D. (played by Dick Hatton) appears in Doc's Dog.
Alice Boyd (played by Joan Meredith) appears in Doc's Dog.
Constable Tibby (played by Milburn Morante) appears in Doc's Dog.
Tom Rance - Promoter and Profiteer (played by Jack Waltemeyer) appears in Doc's Dog.
Mrs. Boyd - Alice's Mother (played by Agnes Aker) appears in Doc's Dog.
Rance's Henchman (played by William Jenson) appears in Doc's Dog.
