Is the red dog in One Piece dead? Who killed him?

He's not dead. When he tried to kill Luffy and was stopped by Ace, Karp asked the Warring States to stop him. Otherwise, he will kill the red dog. Obviously he didn't die, but there was no story about him after the war. The three generals said nothing. It's just that Don Quixote said that he would kill moglia, which was ordered by his superiors and was greater than the world government in the Warring States period.