Mad Dog is the fourth solo studio album by the bassist for The Who, John Entwistle, and his last for six years, and the debut album by his band John Entwistle's Ox. Mad Dog didn't generate much interest, either in sales or among fans, in what sounded like and is often referred as to by fans as "The Son of" Rigor Mortis a second volume of Rock & Roll pastiches rubbing shoulders with items of dubious taste. His next solo album Too Late the Hero would become his most successful while Mad Dog was his least successful solo album until the release of The Rock.