Could Be Constipation by: Kurt (Cat Lovers Only Admin)
Despite all your efforts, and even a visit to the veterinarian, constipation could be the problem. A well adjusted, healthy cat generally does not avoid the litter box, so you have to assume that there is some underlying problem. It could be constipation. It could also be something else, such as impacted anal glands causing the constipation itself.
You'll have to work with your veterinarian to determine exactly what's going on, whether or not the problem is physical, and what to do about it.
