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My dog on thyroid meds: thirsty, hungry, aggressive. Is dose too high?

Updated On September 23rd, 2025

Pet's info: Dog | Puggle | Male | neutered | 8 years old | 45 lbs

My dog has been taking levathyroxine for about a month now and I noticed hes been drinking a lot more water and always wanting to eat. His level of energy has increased but I am bit worried that the dosage may be interfering with his hormones. He seems to be more aggressive and barks a lot more when I eat or someone else eats. Should I be worried?

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1 Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on August 4th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! I would have his thyroid rechecked soon. Schedule an appointment to have his T4 rechecked 4-6 hours after the pill is given. The dose may be too high causing hyperthyroid signs. Signs of too much thyroid hormone is increased thirst, urination, hunger, increased activity, weight loss. I wish you both the best!

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