Snoot and Muttly (1984)

Early computer animation produced at Ohio State University. This has appeared in a number of computer graphics compilations, sometimes shortened and/or with different music. Here it is in its pristine entirety.
Trivia: the music here was created by John Berton Jr., who went on to become an accomplished computer animator in his own right, including a stint at ILM, and has served as effects supervisor for a number of high-profile movies since then.