Hi EllaRose,
What a shame for you and Dot. That is really puzzling. If her thyroid levels are that low I really don’t understand why the vet would still be giving Vidalta at all. Dots well below the normal range so surely they should be trying to bring her numbers up rather than down. Did the vet give an explanation for why he wanted to continue the meds?
Also, you mentioned Dots kidneys, if she already has some issues with her kidneys, lowering her thyroid too much could also have a negative effect on them.
My Bailey is HyperT and it’s taken us quite a few months to get his dosage right (he’s on felimazole), It was too high at first and he became very lethargic and gained far too much weight. That was despite his T4 levels still being in the high end of normal. My vet was very wary of lowering his dose, but as an owner, you know your cat and he agreed to try Bailey on a lower dose. My vets view was to treat the cat, not just the numbers.
We had to go through a period where Bailey was getting his bloods checked every other week until things balanced out. Not fun for either of us but it meant I knew what was happening with him and he’s been very stable now for a while.
In your position, given Dots results, I would also be considering stopping the meds for a short period of time and then retesting the thyroid levels. But I'm no vet.
My boy Jake, who passed recently was HyperT as well and when he started to refuse pills, I managed to get the transdermal gel to put in his ears. My vet knew nothing about it until I told him. I don’t think it’s often used in the UK but he sourced it for me. So, whilst I always listen to my vet, I also do my own research and trust my gut instinct. They don’t always have all the answers and your vet should work with you. I’m lucky to have a vet who is happy to discuss everything with me. He jokes that he now has my number on speed dial
My advice would be to speak to your vet again and ask them your questions.
I understand what you’re saying about not wanting to bother them, but you having questions shouldn’t be a problem for any good vet. I would certainly be asking him why he's still prescribing vidalta for Dot when her levels are below the normal range.