I would highly recommend he see the veterinarian to rule out a possible urinary tract infection. If this test comes back negative (test can be done in a doctors office) then I would recommend some bloodwork to see if there is another physical reason this could be happening, like diabetes or kidney disease.

The symptoms of a urinary tract infection include: inappropriate urination, increased frequency of urination, increased thirst, difficulty urinating or squatting in one area for a long time and getting nothing but a drip out, blood in the urine. Your cat may also have crystals and or stones in the bladder. Both can cause chronic irritation. Sometimes the crystals are the result of too high or too low pH of the urine. Or they can be a result of infection. Treatment for crystals is to either treat the present infection or change the type of food she eats. There are also oral medications to alter the pH of the urine in the bladder. Your doctor will test the pH when the urinalysis is performed. If your cat has stones in the bladder surgical removal is of the most benefit. Though some choose to try and dissolve the stone slowly with diet changes or medications.

I would also consider the possibility that he may be finding it painful to climb into the litter box. Cats this age can have arthritis. If you can find a box with lower sides to make it easier for him to get into this may help. There are also medications that your veterinarian can prescribe if it is determined this is the case.

The symptoms of kidney disease and diabetes are increased urination, increased thirst, lack of appetite, weight loss, lethargy, vomiting, and diarrhea.

Potential physical causes should be ruled out before trying to adjust behavioral issues. I hope that he starts feeling better soon. If you have further questions feel free to ask.

Thank you

Theresa