Two Easy Ways to Start Earning Rewards!
Become a member today!
Members-only pricing and offers, personalized care notifications, Vital Care points back on every purchase and more!
Already a member? Sign in
Become a credit card member today!
Earn 2X Pals Rewards points at Petco
when you use Petco Pay!
APPLY NOW
Learn More About Petco Pay Benefits

Why does my dog have blood in urine after UTI, but no bacteria?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | 33 lbs

My dog is a mix of English Bulldog and Basset hound. He is 10 yrs old and looks like a baby Saint Bernard. We recently discovered he had a urinary tract infection so that was treated with an injection of antibiotics and given pills to give him for pain and inflammation. a week later we were back at the vet's for another round of antibiotics, this time it was pills for 10 days and again the medicine for pain and inflammation. 2 weeks later we still see blood in his urine but no bacteria, HELP!

3 Answers

Most Helpful Answer

Answered By Mara Howard, DVM

Veterinarian

Published on August 2nd, 2017

I'm sorry to hear Harris is having this issue. Blood in the urine can have a variety of causes, including infection, bladder or kidney stones, a sterile bladder inflammatory process, a growth, prostate issues, or an underlying medical issue. I would recommend he be evaluated by a veterinarian, have any necessary testing done (urinalysis, bloodwork, bladder ultrasound), and try to isolate the cause of his issue to come up with any treatment that may be needed. Good luck!

1Pet Parents found this answer helpful

Related Answers from Veterinarians

Answered By Lindsey Edwards MVB, BSc, IVCA
Veterinarian
Published on July 21st, 2017
Protein in the urine can be from bladder or kidney issues, given the progression of his symptoms this should be investigated in detail. I recommend a specialist ultrasound scan and further urine and possibly blood tests to determine if there is any evidence of kidney disease causing leakage of protein or bladder inflammation from stones or even tumors
1Pet Parents found this answer helpful
Answered By Susan England-Foster
Veterinarian
Published on October 14th, 2018
I am sorry Lexy is not feeling well. I would recommend a possible x-ray of her abdomen to make sure she does not have bladder stones. Bladder stones can cause blood and protein in the urine. Also, I would recommend checking some blood work to look at the protein level in her blood stream and kidney values to make sure they are not causing issues with the urine. It is hard to tell you how serious this is due to not having all the test results back yet. I think Lexy needs just some followed up vet care to determine what is going on. Hope that helps
1Pet Parents found this answer helpful

Smart Picks for Smart Questions

Related Questions

Health & Wellness

Why does my dog keep peeing blood after clear X-rays and meds?

Hello, sorry to hear about Buddy. There are multiple causes of this and may include bladder stones that are not evident on x-rays, a resistant urinary tract infection, an enlarged prostrate, a prostate abscess, and less likely a bladder tumor. To further diagnose why he continues to have intermittent blood in his urine, he may need to have more diagnostics such as an abdominal ultrasound and a urine culture. You may speak with your veterinarian about these next further diagnostics. Hope this helps ad best of luck.

Updated on September 23rd, 2025

Health & Wellness

Why is my senior dog's urine still pink/bloody after antibiotics?

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! It becomes concerning when an older dog develops blood urine that is non-responsive to antibiotics. Having blood in the urine with out bacteria can mean a bladder stone or a bladder tumor. Tests I would consider next would be a urine culture, one belly X-ray to look for a bladder stone and full blood work. If the culture is negative and the X-ray doesn't show a stone then I would worry about a bladder tumor. An ultrasound of her bladder would help diagnose if she has a bladder tumor. Another option before doing more testing is to try a more powerful antibiotic for 3 weeks. But if the blood is still present with out the presence of bacteria then I would go forward. I hope this helps!

Updated on September 23rd, 2025

My dog has a UTI. Why is she bleeding after starting antibiotics?

Frequent licking and blood in the urine are signs of an infection. However if it flared after the start of the antibiotics then I would pursue further testing. Did they do anytime sample tonxhexk for cells and crystals and see what bacteria what present? From there you need an X-ray or an ultrasound to make sure there are no bladder stones as this can require surgery or the problem will keep occurring without.

Updated on September 23rd, 2025

Health & Wellness

Why is my dog still peeing blood after antibiotics & constipated?

I'm sorry to hear that Snare has been having so many urinary issues. There are several possible causes for his ongoing bloody urine and straining. One possible cause is that the bacteria causing his urinary tract infection are resistant to the antibiotic being used. Others include the possibility of prostate issues, bladder stones, crystals or a bladder mass, which could be partially blocking the urethra or causing discomfort. I strongly recommend taking Snare to his vet first thing in the morning for further evaluation. Your vet will likely recommend additional diagnostic tests, which may include a urine culture, x-rays or an abdominal ultrasound. If Snare becomes unable to urinate or is straining, but unable to pass any urine, this is an emergency and should be addressed by an emergency vet immediately. I hope this helps and that Snare is one the mend soon!

Updated on September 23rd, 2025

Why is my old dog peeing blood and having accidents indoors?

He could have a urinary tract infection so he should be examined by a vet. Your vet can run a urinalysis to look for infection and other potential causes. He could also have urinary stones, prostate problem, tumor, etc. If he has an infection then he will need an antibiotic to treat.

Updated on September 23rd, 2025

My senior dog is peeing blood, and antibiotics aren't working. What's wrong?

Antibiotics typically improve UTI signs within 1-2 days so Bakka could have something else like a stone in his urinary tract or even an issue like a prostate gland infection or rarely cancer. As the antibiotics are not working and a stone could cause him to be unable to urinate and have kidney damage, Bakka should be seen by a veterinarian.

Updated on September 23rd, 2025

Health & Wellness

My unneutered dog is bleeding with UTI and enlarged prostate. Why?

Hello, so sorry to hear about Owen. The interactions with your neighbor causing his current clinical signs would be a speculation unless there was obvious trauma to Owen leading to his bleeding. If he has been diagnosed with a UTI as a cause for his bleeding this would be unlikely to have been caused by his abuse. His large prostate is likely associated with his unaltered status. Further diagnostics to consider if his UTI is not responding include a urine culture and abdominal x-rays to check for stones. Once you have confirmed there are no stones within his bladder (this may include also having to check with an ultrasound), then pending his urine culture results, your veterinarian may recommend a different antibiotic for his UTI. Hope this helps and best of luck.

Updated on September 23rd, 2025

Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Share