Here are a couple of sheets showing design and personality explorations by Marc Davis for Brer Fox and Brer Bear.
Marc is defining the overall structure of these anthropomorphic animals. At the same time he is thinking about shapes that are character specific and entertaining.
My favorite is the doodle of the fox's head on the upper left. The way the hat sits on the head, and you only see the nose and some cheek hair. Yet it's already a personality. Brilliant stuff!
The final two images are copies of Marc's animation roughs for the fox.