A Mexico/United States border patrol officer is aided by his police dog, Rinty.
| Actor | Role |
|---|---|
 Rin-Tin-TinRinty | Rinty |
 ArmidaPepita | Pepita |
 John LitelDave (as John B. Litel) | Dave (as John B. Litel) |
 Philo McCulloughFarrell | Farrell |
 Bruce CovingtonDon José | Don José |
 Walter MillerBorder Patrol Commander | Border Patrol Commander |
 William IrvingDusty | Dusty |