Doctor Hugo Hackenbush, Tony, and Stuffy try and save Judy's sanitarium by winning a big race with a finicky horse owned by Judy's boyfriend Gil. There are a few problems. Hackenbush, who was recently put in charge of the sanitarium, isn't really a doctor, he's a veterinarian.

• Metro-Goldwyn-Mayer
• Groucho Marx
• Chico Marx
• Harpo Marx
• Allan Jones
• Maureen O'Sullivan
• Margaret Dumont
• Sig Ruman
• Leonard Ceeley