In our series of questions, we received a second cat-related question.
13+ year old male cat will no longer go in the litter box. I've had
him checked at the vet, and no physical reason. Why does he torture me
Generally, when I hear about cats and litter box issues, the first thing I think is UTI or some other bladder issue. Since you've had the vet look at him, though, let's assume that he's a physically healthy pet.
At 13, one thing that comes to mind is a simple case of senility. Your cat may be suffering from the same thing countless elderly people suffer from. He may, in fact, be forgetting where his litter box is, or it may be that he knows where it is, but his bladder isn't what it used to be, and he just can't make it. Make life easier for him by providing another litter box, or by monitoring him a little closer. Help to remind him where he's supposed to potty.
The next thing that comes to mind is that he's acting out. Just like dogs, when cats don't have enough stimulation, they can act out in many different ways. One common way is urination (particularly in male cats). Make sure your cat gets lots of attention and lots of play throughout the day. Make sure he's getting what he needs.
Lastly, make sure his litter box is extremely clean. Most cats don't like to use a dirty litter box and will often choose your furniture or laundry if their litter box is not clean. Make sure the litter is fairly fresh, all the clumps are scooped out, and the box is cleaned on a regular basis.
Trying all these things may help, but you will also want to make sure you remove the odor from all of his accidents, so he's no longer encouraged to use those same locations. There are a lot of pet odor removing products on the market, but for simple issues, try using a 50/50 water/vinegar solution. It helps remove odor, and the vinegar acts as a simple deterrent.
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