Hector is a minor player in several Tweety and Sylvester cartoons directed by Friz Freleng throughout the 1950s. His usual role is to protect Tweety from Sylvester, usually at Granny’s request. He typically does this through brute strength alone, but some cartoons have him outsmart the cat, such as 1954's Satan’s Waitin', where Hector convinced Sylvester to use up his nine lives by pursuing Tweety through a series of extremely dangerous situations. In most of his appearances, the bulldog is nameless, though he is sometimes referred to as Spike. Freleng probably did not intend the character to be the same bulldog as the Spike he paired with Chester the Terrier in other cartoons.
Hector’s most prominent role was as a regular cast member in the animated series The Sylvester and Tweety Mysteries (1995-1996). In the cartoon, he plays Granny's loyal guardian. The show makes Hector's low intelligence his Achilles heel, as Sylvester is constantly outwitting him. Hector is played by voice actor Frank Welker.