The ranger Jack Dunne and his dog Dynamite are called in to investigate a series of cattle rustlings.

Heralded as a "Universal Thrill Feature," this minor outdoor melodrama starred Dynamite, one of canine phenomenon Rin Tin Tin's legion of imitators. Veteran actor Edmund Cobb headed the human cast as Captain Tom Grant, a Texas ranger impersonating an outlaw in order to infiltrate a gang of smugglers.

Molly White, the new schoolmistress at Silver Creek, makes the acquaintance of Jack Brooks, a wealthy eastern sportsman, when his pedigreed police dog, Dynamite, saves her from serious injury, and they become fast friends.

Dynamite -- Universal's answer to Warner Bros.' canine star Rin Tin Tin -- and his owner Jerry Matthews (Edmund Cobb) come to the aid of a beleaguered rancher in this typical low-budget "doggie melodrama" set in the West.

Molly O'Day and her brother, Josh, are homesteading on and trying to make a living on a piece of government land, but local rancher Dave Crenshaw claims the land is part of his holdings, and he and his henchmen try to drive the O'Days off. Cowhand Jerry Wilson and his dog, Dynamite, come to their aid against Crenshaw.

Jack Manning (Tim McCoy) arrives in a midwestern town from Gold Creek in Califonia. He brings a message from Goerge Woods (Francis Ford) to his brother Tom Woods (Francis Ford), in a dual role, and niece Mary (Allene Ray, informing them he has struck gold and asking them to join him in California via a wagon train. Jack and Mary fall in love to the great displeasure of Rance Carter (Wilbur McGaugh) who has a yen for Mary himself. Jack and Mary not only have to be wary of Carter's crooked ways and machinations, but also of Indian uprisings, caused by Carter.