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My dog has a UTI. How much Sulfameth/trimethoprim should I give?

Updated On September 23rd, 2025

Pet's info: Dog | Boxer | Female | spayed | 9 years and 2 months old | 70 lbs

My female boxer of 11 years of age, has a UTI. I have Sulfameth/trimethoprim 800/160MG. Could you please tell how much I should give her and for how long? I didn't want to just go by what the I find on the internet. Thank you!

2 Answers

Most Helpful Answer

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Answered By Angel Alvarado, LVT

Licensed Veterinary Technician

Published on February 1st, 2020

Unfortunately, we are legally prohibited from providing a dose in the absence of a physical exam and VPCR (Veterinarian-Patient-Client Relationship). It is important to have a UTI diagnosed by your veterinarian. A sterile urine sample can be collected and submitted for culture and sensitivity. This may identify the organism responsible as well as the best antibiotic to use in treatment. The SMZ-TMP tabs you have may not be effective against the bacteria. Additionally, inappropriate antibiotic use can lead to resistant bacteria and may complicate any underlying condition which could delay diagnosis.

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    Answered By David Elbeze, DVM, MRCVS

    Veterinarian

    Published on

    You should never give your dog antibiotics without having her checked by a vet, this antibiotics is not the antibiotic of choice for a UTI in dogs, I strongly recommend that you take her to your vet , take a fresh urine sample with you in a clean plastic container so your vet can perform a urine analysis.

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