Filmation produced 13 episodes of The Secret Lives of Waldo Kitty and they originally ran from September through November 1975 on NBC Saturday Morning. The show featured two live-action cats, Waldo Kitty and Felecia, and followed their attempts to outsmart a live-action bulldog named Tyrone. An animated segment would ensue wherein Waldo would become a character similar to famous heroes such as The Lone Ranger or Robin Hood. Returning to live-action, the cats would outwit Tyrone and enjoy watching him get into hot water with his owners.
Does this one strike your kitty memory bell at all? I have a vague memory of it but I was busy watching other shows which likely ran opposite it such as The Great Grape Ape or Speed Buggy.