The Test (Rin Tin Tin)

Rinnie is asked to guard the furs of his master, fur trapper Brule Conway. When Rinnie is lured away by another female dog, Conway's winter furs are stolen by Black Wolf, a henchman for the French-Canadian trapper Pepite La Joie. After a series of adventures, Rinnie masterfully captures the evil doers and returns with the furs, winning the hearts of all.