Plot Hugo Z. Hackenbush (Groucho Marx) is a veterinarian who is hired as chief of staff for the Standish Sanitarium, owned by Judy Standish (Maureen O'Sullivan), at the insistence of her most important patient, the wealthy Mrs. Emily Upjohn, (Margaret Dumont), who insists on being treated only by Dr. Hackenbush. The Sanitarium has fallen on hard times, and banker J.D. Morgan (Douglas Dumbrille) is attempting to gain control of the sanitarium in order to convert the building into a casino. Judy hopes that Mrs. Upjohn will make a large donation and prevent that from happening. Meanwhile, Judy's beau, singer Gil Stewart (Allan Jones), who performs in Morgan's nightclub, has spent his life's savings on a racehorse named Hi-Hat. His hope is that the horse, which he purchased from Morgan, will win a big race and the money will allow Judy to save the sanitarium. Unfortunately, he now has no money to pay for the horse's feed, and he and Tony (Chico Marx), who works for the sanitarium, and Stuffy (Harpo Marx), Hi-Hat's jockey, have to resort to trickery to fend off the Sheriff (Robert Middlemass). Tony raises some money by scamming Hackenbush in the "Tutsi Fruitsy Ice Cream" scene, in which Tony gives Hackenbush a tip on a horse, but all in code, so that Hackenbush has to buy book after book from Tony to decipher the code. .....................
