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Does dog hypothyroidism affect heart rate, breathing, CRT, urination?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male

Hi! If a dog has hypothyroidism, what will it's heart rate, respiration rate, and capillary refill time be? Also is it's urination affected? Thanks!!

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on October 5th, 2017

Hi, thanks for using Petco Pet Education Center, formerly Petcoach!

In my experience dogs with low thyroids do not have many vital changes. Maybe if they are lethargic due to hypothyroidism they have lower heart rates (60 bpm when at rest). But their respiratory rates and capillary refill times shouldn't change. Also dogs with low thyroids do not drink or urinate more, that should also not change.

With Hyperthyroidism there are more vital changes but that is a feline disease. Cats drink and urinate more, have higher heart rates and respiratory rates. I haven't appreciated capillary refill changes in cats. Dogs with overactive thyroids are rare and usually are due to a thyroid tumor.

I hope this helps!
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