After inadvertently thwarting a convict's escape attempt, Rin Tin Can flees the penitentiary and ends up with two sheep herders who are being targeted by wool thieves. The robbers, Giuseppe and Aldo, are actually looking for a specific sheep skin tattooed with a treasure map, in order to post their father's bail.

Unwittingly—as usual—Rin Tin Can becomes first the accomplice of the two not-too-bright brothers, then their godfather...