Both cats used an extra large sized litter pan since the time both were in our household.
4-6 weeks ago Scout stopped using the litter pan and started going on our carpet. We found that she had a UTI. From all indications the UTI has cleared up.
We have a follow up appointment on the 31st to confirm. However, Scout continues to go on the carpet even though we purchased an additional litter pan. The litter has no fragrance. Tux uses whatever litter pan the mood hits him which irritates me. I have to think that this is a behavioral issue that perhaps was initiated by the UTI.