Mad Dog was a henchman working for Two-Face in Batman:The Animated Series.
He tries to put a fraud murder attempt on Gil Mason but was failed by Batgirl. Mad Dog went to Gil Mason's house and stayed there which made Barbara think Gil was behind the framing Gordon. Batman investigated the mystery be disguising as Matches Malones but was captured by Mad Dog and wanted to kill him. Mad Dog fought Robin and Batgirl in the underground subway station. He sealed the exit by throwing two grenades at it and later busted Gordon out of jail and took him to Mason and Two-Face. They planned to kill him but before they do but Batgirl and Robin interfered. Batman later arrived and fought Two-Face and his men. Robin was thrown into a wharf by Robin and was later arrested.