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Hector the Bulldog is a bulldog, the pet of Granny. Normally he clobbers Sylvester so he won't eat Tweety Bird. He is muscle-bound and has grey fur (except for A Street Cat Named Sylvester and Greedy For Tweety where his fur is yellow-ish.)
His first prototype appearance was in Double Chaser.
Hector's possible debut 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'.
Outside the Tweety cartoons, Hector is usually also Sylvester's arch-enemy (such as in Little Red Rodent Hood, A Kiddies Kitty, Pappy's Puppy). One cartoon in particular, in Stooge for a Mouse, both Sylvester and Hector (known as "Mike") start off as friends, but turn into sworn enemies thanks to a mouse Sylvester had chased earlier. However in the first two Sylvester/Hippety Hopper cartoons, Hector often insists Sylvester to catch the "giant mouse" for his (Sylvester's) own good.
Hector is essentially not the same bulldog who paired with Chester in two Sylvester cartoons (Tree for Two and Dr. Jerkyl's Hide). Similarly Chuck Jones' famous bulldog who paired with Pussyfoot, Marc Anthony although bearing a close resemblance to Hector, both bulldogs are not the same character.