A Day at the Races is a 1937 Marx Brothers movie. Groucho plays Dr. Hugo Z. Hackenbush in this one, a veterinarian who takes a position as chief of staff at a sanitarium at the insistance of Margaret Dumont's character.
Veoh has this one online, but you have to download their player to see it. No, thank you. Been there, done that. Thought I'd never get the mess cleaned up.
Variety calls it "surefire film fun". The BBC has a mixed review.