The polka-dotted pony is a minor character in The Backyardigans.
The polka-dotted pony is a rare specimen. Without its small polka-dotted feather, it cannot fly and becomes a dull shade of gray. The feather has inscriptions written on it that lead whoever finds it to the pony's home.
When healthy, the pony is mostly white with pink, purple, and yellow polka-dots. When the pony grows sick and becomes unable to fly, it turns gray.
The pony has appeared in one episode of The Backyardigans: "Follow the Feather" from season four.