Why is my senior cat peeing dark, crystallized urine outside the box?
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!
Updated on September 23rd, 2025