A prospector is murdered by The Cactus Kid and his gang, who hope to find the murdered man's goldmine. The miner's dog, Rin-Tin-Tin, recognizes the killers, who thereafter seek to use the dog to locate the lost mine. With the help of a government agent and a young girl, Rinty saves the mine and brings the bad guys to justice.
Rin-Tin-Tin
as Rinty
Walter Miller
as Ramon
June Marlowe
as Dolores Valdez
Josef Swickard
as Juan Valdez
Buzz Barton
as Buzz
Lee Shumway
as Amos Harkey
Julia Bejarano
as Maria, the Dueña
Lafe McKee
as Sheriff Billings
Arthur Morrison
as Limpy
Frank Lanning
as Burke
Bob Kortman
as Jenkins
Victor Metzetti
as Red
