Laughing Dog was once just a stupid puppy. But then he grew up, so now he is a stupid dog. When Master Chief was choosing which dog to take hunting with him, he asked for the smartest dog they had. The guy selling the dogs thought he would be a troll, and give Master Chief the stupidest dog. He gave Master Chief the Laughing Dog, and the two went hunting. Once Master Chief missed, the dog laughed at him.