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My dog has thyroid. Is his medication dosage correct and effective?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Large (61lb +) | Male | 2 years and 8 months old | 85 lbs

My dog has thyroid and is currently consuming medicine thyronorm 100mcg twice a day. I have attached his March 2019 and September 2019 thyroid reports. Could you please tell me if it's improving or not? As per my current vet, it's improving and has aksed me to continue the dose. My family doctor thinks the dose is too high. My dog weighs between 35-40kgs and is a labrador.

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Answered By Dr. Strydom, DVM

Veterinarian

Published on September 21st, 2019

A human doctor is not a veterinarian. Dogs happen to need a higher dose than people of that particular medication due to the way they metabolize it. Do not ask human doctors for veterinary advice. They are not familiar with how animals metabolize drugs. According to the blood results the thyroid is improving but it is actually still too low. On the thyroid medication, the goal is to have the dog's T4 in the high normal range. His is still low.

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    Answered By Dr. Strydom, DVM

    Veterinarian

    Published on

    The typical dose administered to dogs is 10 micrograms per pound (22 mcg/kg) orally every 12 hours. At 100mcg twice a day your dog is severely under-dosed. He should be receiving 800 mcg twice a day.

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