8. Issue: Your cat is accidentally missing the box.
Solution: Getting old is tough. Your cat could be missing the box due to age-related diabetes or arthritis. Talk to a vet to see if a health problem is involved. If the doctor gives your cat a clean bill of health, it could be something to do with the space surrounding the litter box. Re-train your cat to use the box by putting it in a tight space where litter is the only option for release. Also be sure to clean up all accidents thoroughly, so your kitty isn't encouraged by the scent to pee in the same place again. (VetStreet)