Horace Horsecollar is a cartoon character created in 1929 by Ub Iwerks and Walt Disney. Horace is a tall anthropomorphic black horse and is one of Mickey Mouse's best friends. Characterized as a cheerful know-it-all, Horace helped Mickey on his sleuthing expeditions in the comics before Goofy assumed that role. Horace most commonly appears as a funny animal, although a common gag in his early appearances was his ability to change at will from being a regular horse to a more human-like character.
Horace first appeared as Mickey's plow horse in the cartoon "The Plow Boy" in 1929. Later that same year, he appeared in The Jazz Fool, and afterwards he became a regular member of the Disney supporting cast, along with Clarabelle Cow, Clara Cluck, and other minor characters. In recent years, Horace has appeared in Mickey Mouse Works and Disney's House of Mouse.