Puss Gets the Boot is a 1940 American animated short film and the first short in what would become the Tom and Jerry cartoon series, though neither are yet referred to by these names. It was directed by William Hanna and Joseph Barbera, and produced by Rudolf Ising. It is based on the Aesop's Fable The Cat and the Mice. As was the practice of MGM shorts at the time, only Rudolf Ising is credited.
— Wikipedia