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

Updated On September 23rd, 2025

Pet's info: Dog | Shih Tzu | Male | neutered | 9 years and 8 months old | 21 lbs

My dog has had a bladder infection for a little while he has just finished a course of antibiotics and is still having blood in urine as well he seems to be having trouble pooping. When he urinates he does not pass a lot of urine just smaller amounts but is passing more than just dribbles

2 Answers

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on December 1st, 2019

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!

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Other Answers

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    Answered By Sara Farmer, DVM

    Veterinarian

    Published on July 9th, 2018

    There are a few possibilities: one would be that the bacteria present in the urine is resistant to the chosen antibiotic. This is becoming more of a problem as antibiotic resistance grows, and your veterinarian may want to take a sample for culture to determine what bacteria is causing the problem and what drug(s) it is susceptible to. Bladder stones or a bladder or prostate tumor would be another possibility. I would recommend rechecking with your vet - they may recommend blood work, x-rays, or an ultrasound as a next step along with a urine culture.

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