Javascript is either disabled or not supported by this browser. This page may not appear properly. Sometimes, a cat that had been behaving normally would suddenly start leaving its messages in one particular area or all over the house. Setting up multiple litter boxes and changing the type of litter provided no solution to the problem. It had its owners at their wits end.
Cats are normally very clean animals.
An unneutered male cat, or sometimes, even a female, will spray to mark its territory. Urine from an unneutered cat has a very strong, musky odor which is practically impossible to eliminate. When a cat won't use a litter box, there are underlying reasons for it, which can be mental, physical or both. The possibility of an infection in the urinary tract should be considered. Infections can cause severe irritation and the cat may not have bladder control.