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In this comedy, dishonest stable boys from Britain and France join forces in a smuggling operation. Using a horse blanket, the crooks stuff a horse blanket full of counterfeit money. Unfortunately the horse they've chosen to wear the blanket is hurt and taken out of the race and the bad boys must choose a replacement. He is the worst horse in the stable, Dunderhead. When the nag's jockey overhears the stablehand's scheming he stops them and manages to prove that there is more to his horse, indeed a champion, by winning the Big Race.