The Backyardigans - Season 2 Episode 9 Horsing Around

Uniqua and Pablo are a cowgirl and a jockey. When they argue about who is a faster rider, they decide to settle the matter with a race to the end of the Mississippi River, with Austin serving as the announcer. To their surprise, Tyrone enters the race on a tired, old-looking donkey named Burro. As the race progresses, the two make a quick dash for the finish, but Tyrone and his donkey gain ground as the two continuously stop to argue who is better.