Sheriff Terrorbull is the ruthless sheriff of Moo Mesa. A big intimidating red bull who is rightfully feared along the Mesa. He takes order from only one cow Mayor Baloney, who appointed him as Sheriff of Moo Mesa. Although he appears to be on the side of the law, behind closed doors he is one evil side of beef. Terrorbull is secretly The Masked Bull. A notorious outlaw who terrrorizes the citizens of Moo Mesa. Only the C.O.W-Boys have stood in the way of this evil perpetrator and foiled his plans many times. Terrorbull hates the C.O.W-Boys because of this, but it is Marshal Moo Montana who he hates above all else.

His voice actor is Joe Piscopo.