Mel Blanc

Porky Pig / Porky's Poppa / Grandpa / Horse Trainers / Race Starter (voice) (uncredited)

Joe Twerp

Race Commentator (voice) (uncredited)

Pinto Colvig

Teabiscuit /Porky's Car (voice) (uncredited)

Earle Hodgins

Auctioneer (voice) (uncredited)