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Why is my senior cat peeing dark, crystallized urine outside the box?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Male | neutered | 16 years and 4 months old | 18 lbs

I have a 16yrd male cat that has started peeing in things beside his litterbox. He peed in my clothes basket & it was a lil darker & looked crystallized. He would never use litter in a box I used newspaper or papertowels. Is there anything I can do to help him? He has been neutered also. He is my baby & this has me stressed out...please help. Thanks Becky South

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Answered By Daniel Fonza, DVM

Veterinarian

Published on November 25th, 2017

Hi there and thank you for using Pet Coach! With your description, I would recommend having him examined by a veterinarian and having his urine tested. He may have crystals in his urine with a secondary urinary tract infection. If he does have crystals in his urine, there is a chance he already has stones in his bladder or will develop bladder stones down the road in the near future. With crystals and stones, male cats run the risk of getting a urinary obstruction, which can be life threatening if not treated as it will cause backup of the urine into the kidneys and lead to kidney failure and other systemic abnormalities secondary to the obstruction. I would have this checked sooner rather than later because if you wait until he is obstructed, it can easily cost up to $3000 for treatment. If you take him now, it is the exam fee, urine test and treatments, which come nowhere near $3000. I hope this helps guide you int he right direction! Please let me know if you have any other questions or concerns and I would be more than happy to help you further!

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