Horace Horsecollar in the context of "The Jazz Fool"

Ubbe Ert "Ub" Iwerks (/ʌb ˈaɪwɜːrks/ ub EYE-wurks; March 24, 1901 – July 7, 1971), was an American animator, cartoonist, character designer, inventor, and special effects technician. He was known for his early work with Walt Disney, especially for having worked on the creation of Mickey Mouse and Oswald the Lucky Rabbit, among other characters.

Iwerks and Disney met in 1919 while working at an art studio in Kansas City. After briefly working as illustrators for a local newspaper company, they ventured into animation together. Iwerks joined Disney as chief animator on the Laugh-O-Gram shorts series beginning in 1922, but a studio bankruptcy would cause Disney to relocate to Los Angeles in 1923. In the new studio, Iwerks continued to work with Disney on the Alice Comedies as well as the creation of Oswald the Lucky Rabbit. Following the first Oswald short, both Universal Pictures and the Winkler Pictures production company insisted that the Oswald character be redesigned. At the insistence of Disney, Iwerks designed a number of new characters for the studio, including designs that would be used for Clarabelle Cow and Horace Horsecollar.

Clarabelle Cow is a cartoon character created by The Walt Disney Company. As a domestic anthropomorphic cow, Clarabelle is one of Minnie Mouse's best friends. She was once depicted as the girlfriend of Horace Horsecollar, although now she is often paired with Goofy.

Mickey's Revue is a 1932 Walt Disney cartoon, directed by Wilfred Jackson, which features Mickey Mouse, Minnie Mouse, Horace Horsecollar and Clarabelle Cow performing a song and dance show. The film was delivered to Columbia Pictures on May 12 and released on May 25, 1932. It was the 41st Mickey Mouse film, and the fifth of that year.

A yokel in the audience laughs uproariously at every act; the character would soon be known as Dippy Dawg, and would eventually become a major supporting character, Goofy. Pinto Colvig's memorable "witless laugh" could be heard in the previous Mickey Mouse cartoon, The Barnyard Olympics, but this is the first time the character can be seen on screen.