The Three Stooges + Comedy Gold Standard S02 E01 S2:E01 - Horses' Collars

The Stooges are private detectives in the Old West trying to help a girl recover an IOU from a bad guy. Their attempts to steal the IOU from the villain's wallet, then from a safe, meet with problems until Curly, who goes berserk whenever he sees a mouse, knocks out all the bad guys.