Problem One: basketballs are really hard to pop, and probably could not be popped by a cat's claws. Problem Two: Cat claws are retractable and therefore would be retracted if a cat did play basketball.
Runners-up: Blondie, Brevity, Curtis, Family Circus, Hagar the Horrible, Mother Goose and Grimm, Piranha Club, Rhymes with Orange
I love Pig.
Runners-up: Agnes, Doonesbury, Get Fuzzy, Lio, Mutts, Speed Bump