My cat has always been great about using his litter box, but one day decided he would only pee in it. Now he poops on the basement floor (not far from the box). I know cats often stop using their boxes when they are facing health issues, but if this were the case, wouldn't he abandon it altogether? It's not a huge deal, as he only uses the cement floor and it's as easy to clean up as if it were in the box, but I'm just curious about the behavior. Thanks for reading!