I bought a clever cat (top entry litter box) for my cats (I have two boxes for the three due to space limitations and that seems to work for them). I bought this because bf complained about litter on the floor (I sweep it up, but he notices the slightest amount of stray litter). At any rate- I have had it set up for a week and they don't seem to use it (about one pee ball and that was it). They have been using their other litter box which is "open air" I introduced the top entry box to them the first day and they all could climb in and out. I set it up with the lid on because I did not think they would care. I am thinking that it may be too small for them (they are all around 12-14 pounds) and it looks like when they sit in it there is "just enough room." I took the lid off to see if that makes a difference. They used to use a covered side entry litter box but it's been awhile. I think they prefer the open air type. At any rate anyone have experience with the commercially available top entry cat boxes? I am not sure if the issue is that the box is too small for them (that they would use this type of box if it is bigger). Or they just feel "claustrophobic" in a top entry box. Any advise would be greatly appreciated. I took the lid off the box this am to see if it makes a difference. How big should a box be relative to the cat. If it is an enclosed box, should it be bigger (since they can't "hang over the edge" when using an enclosed or high sided box? I appreciate any advice that might be offered. My bf thinks I should just get another clever cat box and then "they'll have to use it" but I don't want to force them into something that they don't like. I want them to like their boxes.