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Why does my dog's UTI keep coming back after antibiotic treatment?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | unspayed | 21 lbs

so my dog had a uti and i took her to the vet and they ran a test to confirm it was , they gave her amoxicillin and less than 24 hours after being off (after 10 days) it was immediately back they then gave her clavamox and she again finished her 10 day cycle two days ago and the last time she went to the bathroom she had blood in her pee again, but hasnt started frequently urinating(atleast not yet) do you know why this could be?

2 Answers

Most Helpful Answer

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Answered By Jenna Beyer, DVM, MBA, cVMA

Veterinarian, Certified Veterinary Acupuncturist

Published on August 8th, 2017

Many times there is an underlying cause of recurrent UTI-like symptoms. Daisy likely needs additional diagnostics, like: Urine sediment exam: to look for crystals in the urine Abdominal x-rays: to look for bladder stones that cause inflammation and can create an environment for UTI Abdominal ultrasound: to look for possible tumors Urine culture: to look for resistant bacteria, this will also help your vet determine the best antibiotic to use. Other medications to consider are anti-inflammatories, prescription urinary diets, and bladder support supplements; you can discuss this with your veterinarian.

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    Answered By Amber W

    Veterinarian, Certified Veterinary Acupuncturist

    Published on August 4th, 2017

    Poor Ribzy! Dealing with multiple UTIs is no fun! Clavamox can be a good choice for a UTI however if multiple utis are being seen a couple things may be happening. One, Ribzy could have a bladder stone or some other bladder abnormality that are causing repeat infections. Secondly, a resistant bacterial infection could be causing the issue. Third, a recessed vulva or some other anatomical abnormality could be the cause of repeat infections. Finally, it is possible that there isn't a true infection and the blood is due to bladder inflammation or even a bladder mass. I think you should consider a recheck for Ribzy so X-rays and maybe even a Urine culture can be performed. Hope she is feeling better soon!

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