My cat has bloody urine after UTI meds. Is it still an infection?
Updated On September 23rd, 2025
Pet's info: Cat | Korat | Male | neutered | 15 years old | 11 lbs
My cat is just completing 28 days of antibiotics for a UTI but still has blood in his urine. He's 15. Is it still possible it could be an infection? I'm preparing for bad news.
4 Answers
Most Helpful Answer
Published on August 2nd, 2018
Thanks for using Petco Pet Education Center, formerly Petcoach! I definitely understand your concern. There are a few possibilities here. This could be due to an infection that is resistant to the antibiotics being given or it could be something else like stones or a tumor. I highly recommend that you consider taking Tao to his veterinarian for reevaluation. Diagnostics that should be considered at this point include a urine culture to make sure that if there is an infection, you know which antibiotic would be best to use. Other diagnostics should include abdominal imaging such as radiographs or ultrasound. Good luck and have a great day!
1Pet Parents found this answer helpful
Related Answers from Veterinarians
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Published on March 27th, 2019
Hello and thank you for reaching out to Petco Pet Education Center, formerly Petcoach. If your cat is having bloody urine, this could be due to a UTI that is not being treated with the correct antibiotics. It is always recommended to have a urine culture and sensitivity performed to determine what bacteria are present and to what antibiotics they are susceptible. Other causes of hematuria include bladder stones, which can often be diagnosed on abdominal x-rays but can require abdominal ultrasound to definitively diagnose. Stones can be the reason that a UTI does not resolve even with antibiotic treatment, so they need to be ruled out. An abdominal ultrasound would also help a vet see if there is any evidence of cancer within the bladder. Bloody urine can also be seen with feline idiopathic cystitis, or FIC, which is a sterile inflammation of the bladder and lower urinary tract, typically caused by stress. There may be no other signs besides hematuria and straining to urinate with either stones and/or bladder cancer, so an abdominal ultrasound will help the most. I hope this is helpful!
1Pet Parents found this answer helpful
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Published on June 3rd, 2018
There are 3 main reasons why cats urine may have blood in it. A urinary tract infection, bladder or kidney stones, or feline lower urinary tract disease (non-bacterial inflammatuon of the bladder). New stresses are a big culprit. I would make an appointment to get him seen. They will perform a full exam, a urinalysis, lab work, and a bladder xray. In addition, make sure you have enough litter boxes. 1 per cat PLUS 1. Make sure they are cleaned daily, and away from any loud or scary noises. If his tests are all normal, you add the litter boxes, you decrease stress, and clean often. If there is no UTI, but blood, it is most likely the feline lower urinary tract disease. Your veterinarian can then discuss treatment with a diet change, and medications. Good luck.
1Pet Parents found this answer helpful
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Published on December 16th, 2016
This is quite concerning and further investigations including an ultrasound exam of the kidneys and bladder, testing of the urine and x-rays for the presence of stones may be needed if the condition does not start to improve. You do not mention what you are treating him with so it is impossible to advise on any additional measures which may help
1Pet Parents found this answer helpful
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