If the anime was never completed, Then you're in luck. You can continue the story by reading the completed manga. This list has basically the same rules as a couple of my other ones, includes anime originally based on a manga, no...
Anime with cats and kittens in it. Also includes wildcats, robo-cats, beings that look like cats, and people who turn into cats.
These are shows that have cats as a main theme or cats show up very frequently in these anime.