Armour desiccated thyroid, levothyroxine, Synthroid, Soloxine, T4, T3
Toxicity to pets
Pets — especially dogs — can have underactive thyroids too. Interestingly, the dose of thyroid hormone needed to treat hypothyroidism in dogs is much higher than the dose needed for humans. One time, or acute, ingestions have a fairly wide margin of safety in dogs and cats. If pets accidentally get into a few tablets of thyroid hormones at home, it rarely results in problems. However, large acute overdoses in cats and dogs can cause muscle tremors, nervousness, panting, a rapid heart rate and aggression. When in doubt, contact Pet Poison Helpline to see if your dog or cat ingested a toxic, poisonous amount.
The content of this page is not veterinary advice. A number of factors (amount of substance ingested, size of the animal, allergies, etc.) determine what is toxic to a particular pet. If you think your pet has eaten something potentially toxic, call Pet Poison Helpline or seek immediate veterinary treatment.