I have a 5 year old neutered male cat that has been pooping outside of the litter box for about 6 months now. I have 2 large uncovered litter boxes, use and have used Worlds Best Cat litter for 3 years now. I keep the litter boxes very tidy, scooping once and sometimes twice a day. Not much has changed in the house that would warrant this behavior. The vet has cleared him health wise so I don't know what's going on. I clean up every mess with Natures Miracle to remove the smell from my hardwood floors. I have another cat, an 8 year old female who has been in his life as long as we've had him. She's an angel and he's a little stinker! Any help/tips/guidance as to resolving this issue?? I'm desperate and getting very tired of cleaning up his mess almost every day!