Madame Mousey is the main antagonist of An American Tail: The Mystery Of The Night Monster,the fourth and final sequel of the American Tail series. She is a
miniature French poodle who has started living among the mice about this time, appearing at every crime scene where the Night Monster strikes, claiming to be a fortune teller.
She is also the mastermind behind the night monster all along. She is voiced by Candi Milo.