Francis Goes to the Races (1951)

Peter's been friends with Francis since Burma. Francis is a talking mule. He ends up being sent to the race tracks with Travers' race horses. Peter gets a ride there from Miss Travers. Francis tells Peter who's winning the horse race and he bets $10. FBI agents are suspicious as to how he knew. Miss Travers steps in and helps him. Peter gets a job with the Travers looking after the horses. With a big race coming up, Peter's problems with the FBI and a mob boss are not over.