Mickey's Makeover (1938)

In the year 1938 Mickey Mouse had a drastic makeover. The animators wanted to create characters that had similarities to themselves. Fred Moore was the animator who made changes to Mickey Mouse's head and his body shape. He was small, and had mouse-like features. Moore's design of Mickey Mouse is the classic Mickey Mouse we know today. In 1940, the public viewed the new Mickey Mouse in the sorcerer's-apprentice in Fantasia. In 1941 more changes were added to the animation of Mickey Mouse. Animators, Moore and Kimball removed his tail and added an interior to his ears and they dressed him as a dandy.

-Arianna Quinn

http://articles.sun-sentinel.com/1995-08-10/lifestyle/9508090253_1_animators-mickey-mouse-mouse-makeover/2