What year was mickey mouse invented in?

In the spring of 1928, Disney asked Ub Iwerks to start drawing up new character ideas. Iwerks tried sketches of frogs, dogs and cats, but none of these appealed to Disney. A female cow and male horse were also rejected. They would later turn up as Clarabelle Cow and Horace Horsecollar.[3] Walt Disney got the inspiration for Mickey Mouse when he saw a dead mouse on the traintracks. In 1925, Hugh Harman drew some sketches of mice around a photograph of Walt Disney. These inspired Ub Iwerks to create a new mouse character for Disney called Mickey Mouse.[4]

“We felt that the public, and especially the children, like animals that are cute and little. I think we are rather indebted to Charlie Chaplin for the idea. We wanted something appealing, and we thought of a tiny bit of a mouse that would have something of the wistfulness of Chaplin — a little fellow trying to do the best he could.”

“When people laugh at Mickey Mouse, it’s because he’s so human; and that is the secret of his popularity.”[1]

“I only hope that we don’t lose sight of one thing — that it was all started by a mouse.” — Walt Disney [5]

Mr. Disney originally named the character Mortimer Mouse, but his wife insisted that this was a poor name choice.[6][7]