Extra Large Stainless Steel Litter Box with Lid, High Sides Enclosed Cat Litter Box for Big Cats & High Peeing, Anti-Leak & Odor Control Metal Litter Pan, Easy Clean Non-Stick Kitty Litter Box

I have a 16lbs boy cat and I got him this one a little over a year ago on Amazon. It's just an XL, but he fits in it fine. I would probably go with an XXL if I bought another one, just to give him some extra space. He doesn't have any issues fitting this one though. The rare time he poops outside of the box, it was just because I hadn't cleaned it yet that day... he's vindictive like that lol. I did have to stop using the sides to it and the little step down thing, because he'd just poop there sometimes instead of inside the box and it was becoming a pain to keep cleaning the holes... https://a.co/d/0cGlWPrZ