Characterized as a boastful show-off, Horace served as Mickey’s sidekick in Disney's early black-and-white shorts.

[1] Later that same year, he appeared in The Jazz Fool and afterwards became a regular member of the Disney supporting cast along with Clarabelle Cow and Clara Cluck.

In the television series House of Mouse, Horace has a recurring role as the club's technician, playing cartoons for the audiences and generally running the machinery.

Farmer established the character's voice on the spot during recording for The Prince and the Pauper, when the director surprised him with the request.

On his way to Walt's office, though, he gets abducted by aliens who bring him halfway across the galaxy because they are in desperate need of the hero that they believe Horace is, despite his dreams of returning to Earth and resuming his acting career.

In these, he plays a much bigger role than elsewhere, accompanying Mickey on his adventures or acting as Clarabelle Cow's paramour and fiance.

Characters were depicted in ways intended to match the style of the songs they DJed - as part of this, Horace was shown in a dreadlocked wig and "Caribbean" clothes.

In 2016, Horace made an appearance along with Clarabelle Cow in Disney Crossy Road as an unlockable playable character under the Mickey and Friends theme.

Horace Horsecollar made his meet-and-greet debut at Disneyland in Anaheim with Clarabelle Cow as part of Character Fan Days Weekend.[when?]