I have a cat who is missing his left front leg. Since I thought he may have a hard time getting into the litter box, I found a litter box (in dog department of a pet store) that has about a 6 inch space on the center on one long side that is lower than the rest of the sides. That is always how he gets into the litter box. I thought this might be an item for you to try since your beautiful BOO is so small and maybe he does not like jumping over the side of the box to enter it. Good luck!