Case File: Cerberus vs. Heracles
Case Description: Complainant (Cerberus) accuses Defendant (Heracles) of dognapping. As his twelfth labor, Heracles captured Cerberus and dragged him back to the land of the living.
Case Status: Dismissed. Hades and Persephone signed off on Heracles borrowing Cerberus for a bit. Cerberus was taken immediately back to the Underworld, so no harm no foul.