His first appearance was Double Chaser.
Hector's second appearance in the 1945 short Peck Up Your Troubles paired with Sylvester and a woodpecker. His second appearance was in A Hare Grows in Manhattan. After that, Hector was a minor player in many Sylvester & Tweety cartoons, including 1954's Satan's Waitin' the devil. He also has a role in the series The Sylvester and Tweety Mysteries, where Sylvester is constantly outwitting him.