No personal experience of it but have read a bit about it.Dr Jean Dodds is a reknowned expert on this & other immune diseases. The link below is to her site, people from all over the world send their dogs blood to her lab for testing & advice. What breed of dog is it thats been diagnosed with it?
http://www.canine-epilepsy-guardian-angels.com/ThyroidDisease.htmChristine, Spain.