Screwball Squirrel
Directed by Tex Avery
Screwball Squirrel is basically an MGM Bugs Bunny clone, and it shows in this, his first appearance, in which he torments Meathead the dog, who he goads into chasing him. But as derivative as it is, there really are some interesting things done in terms of poking fun at the whole cartoon short format and breaking the fourth wall, which makes it worth watching.
[IMDb]