Buzzy Rides the Range (1940)

All the ranchers are losing cattle but are unable to find the rustlers. Posing as a prospector, Agent Ken Blair arrives and teams up with young Buzzy to look for them. After Buzzy overhears Ames' men talking, Blair finds evidence that Ames is using trucks to haul away the beef. Looking for tire tracks, Buzzy locates the rustling operation and sends his horse back with a message.