A.M.
I have been fostering and rehabilitating sick, injured, neglected and abused cats for over 12 years. Without more info from you regarding the particulars here's my advise:
1) Buy a brand new litterbox (sometimes cats can get sensetive to the odors harbored after years of use).
2) Buy Cat Attract litter (found at all petstores and is only a few bucks more than the regular brands).
If that doesn't fix the problem, please send me more information, such as:
- How long you have had him and what is his age?
- How long has this been going on?
- Is this only for stool, or is he inapproapriately urinating too?
- Is there stress in your household that started about the same time that this behavior started? (death in the family, loss of job, house foreclosure, divorce, financial troubles, new addition to the family, guests coming to the house more frequently).
- Is there any blood in the stool or change in his diet?