Spoiler (click to reveal)
Noodles the Dog. due to repeated references and stats in the Traitor's Tome, at first we thought it was a misprint in the Haunt guide grid and that the omen card The Dog was supposed to have triggered the haunt, because the Clown was clearly supposed to have some kind of dog to use to attack heroes.
now we're thinking that the Clown is supposed to get a Monster that is Noodles the Dog, but it most definitely doesn't say "place a Monster token on the board; this is Noodles." maybe this sentence got omitted?