The Lone Defender (1930)

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.

Directed by: Richard Thorpe

Starring: Rin-Tin-Tin, Walter Miller, June Marlowe, Josef Swickard, Buzz Barton, Lee Shumway

Links: IMDb, Movie posters, Movie stills