"Doctor Hugo Hackenbush, Tony, and Stuffy try and save Judy's farm by winning a big race with her horse. There are a few problems. Hackenbush runs a high priced clinic for the wealthy who don't know he actually has a degree in veterinary medicine."
Groucho Marx
as Dr. Hugo Z. Hackenbush
Chico Marx
as Tony
Harpo Marx
as Stuffy
Allan Jones
as Gil Stewart
Maureen O'Sullivan
as Judy Standish
Margaret Dumont
as Emily Upjohn
Sig Ruman
as Dr. Leopold X. Steinberg
Leonard Ceeley
as Whitmore
Douglass Dumbrille
as Morgan
Esther Muir
as 'Flo' Marlowe
Robert Middlemass
as Sheriff
Vivien Fay
as Specialty Dancer
Ivie Anderson
as Specialty Singer
Gino Corrado
as Man Boarding Bus (uncredited)
Bess Flowers
as Racetrack Spectator (uncredited)
Bert Moorhouse
Frank O'Connor
as Racetrack Guard (uncredited)
Carole Landis
as Party Guest (uncredited)
Etta Moten
as Black Singer (uncredited)
Dorothy Dandridge
as Singer (uncredited)
Byron Foulger
Sam Wood
Director
Irving Thalberg
Producer
Robert Pirosh
Screenplay
Joseph Ruttenberg
Director of Photography
Frank E. Hull
Editor
Lawrence Weingarten
George Seaton
George Oppenheimer
Franz Waxman
Original Music Composer
Robert A. Golden
Assistant Director
Leonard Smith
Cedric Gibbons
Art Direction
Story
Edwin B. Willis
Art Department Assistant
Dolly Tree
Wardrobe Designer
Douglas Shearer
Sound Director
Bronislau Kaper
Songs
Walter Jurmann
Gus Kahn
Lyricist