The best person to talk to about your cats individual urinary issues is, of course, your veterinarian. Rule Out Any Medical Issues. If your cat is peeing outside the litter box, the first step is to consult with a veterinarian.
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Cats Need to Eat Water-Rich Food. Opies pictorial at Feline Urinary Tract Diseases is a must see for any cat caregiver who insists on feeding dry food. The first paragraph of that page is as follows

By monitoring your cat's urinary health, you can catch potential issues early, ensuring prompt treatment and preventing more severe complications that could significantly impact your cat's overall well-being.
Ammonia is one component of cat urine, and if cats smell that, theyre more likely to [pee there again], says Dr. Bruce Kornreich, DVM, Ph.D., senior associate director of the Cornell Feline Health Center.
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Unlike some minor pet health issues, UTIs can become life-threatening fast, especially if theres a blockage (more common in male cats). Signs Your Cat May Have a UTI. Recognizing symptoms early can save you hundreds in vet billsand potentially your cats life.