Mickey Mouse universe
In "Plane Crazy" (1929), the first produced Mickey Mouse story, Mickey is seen at a farm. In all of his early films Mickey is in a rural setting, but most commonly at a farm. This setting was succinctly presented in the first sentences of one of Mickey's first storybooks:
Mickey Mouse
"When the Cat's Away" (April 18, 1929), essentially a remake of the "Alice Comedy", "Alice Rattled by Rats", was an unusual appearance for Mickey. Although Mickey and Minnie still maintained their anthropomorphic characteristics, they were depicted as the size of regular mice and living with a community many other mice as pests in a home. Mickey and Minnie would later appear the size of regular humans in their own setting. In appearances with real humans, Mickey has been shown to be about two to three feet high. The next Mickey short was also unusual. "The Barnyard Battle" (April 25, 1929) was the only film to depict Mickey as a soldier and also the first to place him in combat. "The Karnival Kid" (1929) was the first time Mickey spoke. Before this he had only whistled, laughed, and grunted. His first words were "Hot dogs! Hot dogs!" said while trying to sell hot dogs at a carnival. "Mickey's Follies" (1929) introduced the song "Minnie's Yoo-Hoo" which would become the theme song for "Mickey Mouse" films for the next several years. The "Minnie's Yoo-Hoo" song sequence was also later reused with different background animation as its own special short shown only at the commencement of 1930s theater-based Mickey Mouse Clubs. Mickey's dog Pluto first appeared as Mickey's pet in "The Moose Hunt" (1931) after previously appearing as Minnie's dog "Rover" in "The Picnic" (1930).