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Is an iodine-free diet safe for my elderly cat with hyperthyroidism?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | spayed | 12 years and 9 months old | 15 lbs

My elderly cat, I'm almost sure has hyperthyroidism. She was just on the cusp with her bloodwork. But she meets the other symptoms. Excessive hunger and thirst. She's began biting me when her bowl is empty. Hyperexcitablity at night... so my question is, would it be safe and productive to begin feeding her a iodine free diet? My vet said to being her back in three months for testing, but should I just get a jump on her treatment. Can iodine free diets be dangerous?

1 Answer

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on October 22nd, 2017

if she is borderline and symptomatic they can send a thyroid test that can test more than just the in house version for a more definitive complete answer. Also they do make a food tailored to hyperthyroid cats that can help maintain the thyroid level. It is not safe to do if the number it not high though and it has to be the only food she gets. It is called science diet Y/D. I would talk to your vet about sending off a complete thyroid panel prior to any changes

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