The only other thought (DUH) was a kitty condo, we got one when Solomon was rather advanced in age and didn't always make it to the box. I totally spaced on the flea thing as all mine are indoor,sorry been so long my alzheimers was showing . He loved the Condo as he stayed in view of everyone and we took him out for cuddles etc but if we weren't going to be "right there" we put him back in. Comes in handy all these years later with rescues too!