Rex, a wild stallion, and Rinty, a police dog, are pals. Their master , John Sheldon, is framed for murder, and Alice Ingram plans to race Rex for money to pay for John's legal defense. Meantime, Frank Nolan, who has falsely accused John, sets out to steal Rex for himself.
Rex
Rin-Tin-Tin Jr.
Bob Custer
Lucile Browne
Ben Turpin
Edmund Cobb
Richard Cramer
Lafe McKee
Ernie Adams
Slim Whitaker
Richard Alexander
Jack Rockwell
George Chesebro