Hypothyroid collie with diarrhea after a week on Levothyroxine

[LinLin64]

Hi - my 9-year-old collie was diagnosed last month as hypothyroid, and the vet prescribed levothyroxine sodium, 600 mcg once a day with food. He has developed diarrhea and last night couldn't keep even chicken and rice down, vomiting it up in the night. He is hungry and eats, but it runs through him. Should i stop or reduce the levothyroxine? Thank you so much for any ideas. BTW, the diagnosis was clear with his thyroid number (not sure it is T4??) being 8, when healthy is over 20 and 10-19 is borderline hypo.

[ginger899]

You need to speak to your vet. It could be that the dose is too high for him, and needs adjusting. Poor dog...I hope he will be feeling better soon and able to keep food down.
Is he keeping fluids down? If not, that is very important. He can't go on like that for more than -say -half a day, without becoming dehydrated -especially if he's been vomiting and has diarrhea. If the vomiting and diarrhea doesn't go away he will get seriously dehydrated very quickly.
If he doesn't keep fluids down he will need fluids by IV as soon as possible.

Try an unflavoured electrolyte drink such as Pedialyte if you have it/. Otherwise in an emergency, water in which a little bit of honey or maple syrup has been dissolved and a tiny pinch of salt. Then let him have that only in very small doses, see it stays down before giving him more, but see if he will keep enough fluid down.
If he will, then keep giving him the fluid until hopefully you get to the vet within a short time.

[Gordon0071]

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