Merrie Melodies - The Aristo-Cat (1943, animated short)

The Aristo-cat is a 1943 Merrie Melodies short directed by Chuck Jones.
Notes:
Features the debut of Hubie and Bertie. The short also contains an early prototype version of who would later be known as Claude Cat.
Unlike later cartoons where Hubie and Bertie are voiced by Mel Blanc and Stan Freberg respectively (or vice-versa), here they are voiced by screenwriters Michael Maltese and Tedd Pierce.