From Muppet Wiki

Black Dog is a pirate in Muppet Treasure Island. Allied with Blind Pew, this vicious canine leads the raid on The Admiral Benbow Inn, in search of Billy Bones' map. A rather cruel pirate, he threatens Gonzo and Rizzo with threats of death. However, soon Black Dog and his men are fleeing with Gonzo and Rizzo from an ignited trail of gun powder. He eventually is cornered by the trail and is blown out of the inn's roof by an explosion. He also appeared as a member of the Flying Monkeys in The Muppets' Wizard of Oz.