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How to know if my dog's UTI is improving on amoxicillin treatment?

Updated On September 23rd, 2025

Pet's info: Dog | Shih Tzu | Male | neutered | 8 years and 10 months old | 12 lbs

My Romeo Shih Tzu was diagnosed with a UTI on Friday. Today is Monday. He’s on Amoxicillin. He is peeing more than small amounts now. He still marks once or twice a day but always has. Is this a descent amount of urine? He took less than a min to do. I’m just worried about his UTI & hoping it’s improving. He’s eating good etc. He gets another urine test on Friday of this week

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2 Answers

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on December 6th, 2021

This looks like a pretty normal urine puddle for a dog Romeo's size. I think it's encouraging that he's no longer only urinating in small volumes. Signs that his infection would be persisting or worsening include urinating small frequent amounts, straining to urinate, seeing blood in the urine, licking his penis more than normal, or drinking large volumes of water. From what you've described, it sounds as though Romeo is improving so far, but his test on Friday will provide more clarity. Until then, just keep giving the amoxicillin as prescribed. I hope that everything goes well!

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    Answered By Jessica Desrosiers

    Veterinary Technician

    Published on December 11th, 2021

    Since I don't know Romeo's normal urinary volume (your vet may know better), and the newspaper absorbs a lot, it would be hard to give an accurate estimate. A better judge is to watch and see how much he's going how often over a period of a few days, as well as the urine's color (cloudy? yellow? red-tinged?) and if Romeo is straining to go or seems painful when he's going. Switching to a white puppy pad for a few days may also help you get a better visual guide as to how much he is going as well without the newspaper obstructing it. If he's on a more normal (for him) potty schedule, and is eating and drinking well, those are all good signs. If he's having issues or is having urinary trouble still, bringing it up at your recheck appointment is best.

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