Hypothyroid Horse - The Horse Forum
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post #1 of 5 Old 02-02-2018, 03:01 PM Thread Starter
Join Date: Apr 2016
Location: Southeast USA
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Hypothyroid Horse

Has anyone had experience with a horse having low thyroid levels in a blood test? I just briefly talked with my vet's receptionist, and she mentioned the possibility of putting my horse on thyroid meds because of his blood test results. I had a blood panel and Lyme test done on him because he has not seemed well for the past year. He was treated for EPM with three medications last year, but he still doesn't seem right. He is lethargic, sore and aggressive (at times).

I've read a few articles that make it sound like thyroid problems aren't usually an issue for horses. I would love it if thyroid meds improved his attitude/ well-being, but I'm almost afraid of medicating him and ending up with a hyper, aggressive horse.
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post #2 of 5 Old 02-02-2018, 03:30 PM
Join Date: Feb 2011
Location: NE Pa
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A good friend has one. He is medicated with Thyro-L and it's made a world of difference in his attitude (he was super cranky and reactive before) and his weight (he was fat on air).

There is no joy equal to that found on the back of a horse.
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post #3 of 5 Old 02-02-2018, 03:37 PM Thread Starter
Join Date: Apr 2016
Location: Southeast USA
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That's good to know. I hope I will have positive results too!

I just talked with the vet, and he said it's worth trying it for a month to see if it helps.
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post #4 of 5 Old 02-02-2018, 03:43 PM
Join Date: May 2012
Location: CT USA an English transplant
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I had a mare on Thyro-L for a low thyroid level - she had also started to gain weight on 'thin air' along with other problems.
At the time she tested negative for Cushing's Disease which my vet was convinced she had
The Thyro-L did help but he decided to send another Cushing's test off the following year to a different Lab and this one came back positive.
Once on Prascend her thyroid levels have returned to normal without the Thyro-L
I would also get her tested for Cushing's Disease

Just winging it is not a plan
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post #5 of 5 Old 02-02-2018, 03:53 PM Thread Starter
Join Date: Apr 2016
Location: Southeast USA
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Thanks for the suggestion, Jaydee. My horse is not overweight, and he's only 8. I wonder if Cushing's is a possibility.
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