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Thyroid Medications

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Poisonous to: Cats, Dogs

Level of toxicity: Generally mild to moderate

Common signs to watch for:

  • Nervousness
  • Panting
  • Vomiting
  • Elevated heart rate
  • Aggression
  • Muscle tremors

Pets — especially dogs — get underactive thyroids too. Interestingly, the dose of thyroid hormone needed to treat dogs is much higher than a person’s dose. Therefore, if dogs accidentally get into 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.

Poison type: Medications

Alternate names: Armour desiccated thyroid, Synthroid, Soloxine, T4, T3