Why is my dog panting and hyper after taking thyroid medication?

Panting is not a common sign in dogs taking medication for hypothyroidism. However, I did a little digging through some veterinary databases and found some reports of dogs panting excessively with different brands/dyes in the levothyroxine medication. Panting can be a sign that Bobbie's levothyroxine dose is too high, or could be a sign of other conditions, such as heart disease, pain or anxiety. Regardless, I recommend taking her to the vet for further evaluation. They may want to recheck her thyroid blood tests to check her current levels and will want to examine her to check for other problems. I hope this helps and that all goes well!

The only way to know if this is related is to have the thyroid level checked again. I recommend to call your veterinarian and let them know what you are seeing. They will advise on how much medication to give and when to test. The only way to know if Glanni truly has thyroid disease is to stop all medication for at least 2 weeks. Then test a thyroid panel that includes the Total T4, the Free T4 by equilibrium dialysis and the Thyroid stimulating Hormone. This will give you a complete and accurate idea of his thyroid function. I do not advise to make any changes to the medication with out first speaking with your regular veterinarian. Also keep in mind that the behavior could be coincidental and related to something else entirely. Best of luck.

I recommend to have Tommy’s thyroid level rechecked. These are not normal signs from the medication and could inidicate that the thyroid level is now too high or it could be unrelated. That’s why you need to know what his levels are while on the medication. Have the blood sample drawn 4-6 hours after he takes the medication. Best of luck and please feel free to post any additional questions.

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Coco. Poor girl! It could be she is sick, may have injured herself, or this could be a side effect of her levothyroxine. Without seeing her in person, I can't say for certain. I'd have her seen by a vet now to be safe. Best of luck.

Since it has been several hours, inducing vomiting will not help. Dogs take higher doses of thyroid medications than humans do, so it is likely that Roxy will be fine. He may develop some stomach upset. Monitor for rapid heart rate, panting and restlessness or hyperactivity. These are symptoms that should be addressed by your veterinarian or at the nearest veterinary ER. You can also contact the Pet Poison Helpline ( https://www.petpoisonhelpline.com/ ). They are staffed by toxicologists who have more detailed information. There is a fee for the call. https://www.petpoisonhelpline.com/poison/thyroid-medications/

Thank you for submitting your question regarding Juke. I recommend that she sees her veterinarian. She may be experiencing pain in her anal glands, difficulty defecating or a urinary tract infection. Hypothyroidism and the corresponding medications do not typically cause anxiety. If her dosage is too high, it can create hyperactivity though. I hope this information helps!

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!