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My dog has hypothyroidism and is panting. Is it the medication?

Updated On September 23rd, 2025

Pet's info: Dog | Australian Shepherd | Female | spayed | 12 years and 1 month old | 54 lbs

My dog has hypothyroidim and is taking medication for it is panting one of the symptoms

2 Answers

Most Helpful Answer

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Answered By Lauren Jones VMD

Veterinarian

Published on May 17th, 2020

Panting is not a common sign in dogs taking medication for hypothyroidism. However, I did a little digging through some veterinary databases and found some reports of dogs panting excessively with different brands/dyes in the levothyroxine medication. Panting can be a sign that Bobbie's levothyroxine dose is too high, or could be a sign of other conditions, such as heart disease, pain or anxiety. Regardless, I recommend taking her to the vet for further evaluation. They may want to recheck her thyroid blood tests to check her current levels and will want to examine her to check for other problems. I hope this helps and that all goes well!

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on

    Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Bobbie. Depending on the medication she is on, decreased tolerance to heat can be a side effect, which can lead to the panting. I'd give her vet a call to let them know you are seeing this issue, so they can let you know if they want to see her or not. I hope this helps!

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