Quote Originally Posted by newwoman1959 View Post
- I keep several litter boxes, but I'm not particularly diligent about cleaning (I change the litter once each week)
That could be the problem right there. I clean the litterboxes twice a day, morning and night, and more often if I see heavy traffic. Think about it, you wouldn't go for a week at a time w/out flushing your toilet. Cats are fastidious creatures and like their litterboxes clean and fresh. I hope the answer is as simple as that. Good luck.