Can my dog eat thyroid tablets?
No.
Unless your vet prescribed this exact medicine for this dog at their dose. A tablet or two of Thyrox rarely harms a dog — a chewed box can.
Already ate it?
If they ate itOne or two tablets: watch at home. A few: call your vet today with the strength and how many are missing. A chewed box: go to a vet now.
Watch forRestlessness, panting, a racing heart, vomiting, diarrhoea, tremors — within 1 to 9 hours.
Thinking of giving it?
Why not even a littleA few tablets rarely cause problems — vets give hypothyroid dogs around 0.02 mg per kg twice a day, many times a human dose per kg. Large overdoses, like a chewed box, cause a racing heart, panting and tremors.
WhyDogs clear thyroid hormone much faster than people, which is why vets prescribe it to dogs at higher doses. A large overdose still overstimulates the heart and nervous system.
Where this comes from. Pet Poison Helpline — Thyroid Medications; Hansen et al., JAVMA 1992 — Acute overdose of levothyroxine in a dog.
Reviewed: 20 October 2026
A guide, not a diagnosis. If your dog seems unwell, call your vet.
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