Oswald the Lucky Rabbit leaves for the day. Elmer the Great Dane finds himself dealing with some kittens.
The IMDB trivia for this short says it's the last of the Oswald cartoons, despite his appearing in at least nine more Lantz cartoons through 1952, and four animation efforts since Disney regained control of the character. Still, it means that there are no disturbing questions to concern us, like why would a vegetarian rabbit keep pets that eat rabbits? That's the sort of thing that people argue about on the Internet these days, always ignoring the obvious answer: it's a cartoon.