Just a quick note.. I read an article from Kenneth Marcella DVM   the myth of equine hypothyroidism at veterinarynews.dvm.360.com  where Nicholas Frank DVM, says that " it becomes clear that true hypothyroidism is a very rare endocrine disorder in the horse."   I guess this is another reason not to consider thyroid L ? perhaps Dr, Kellon can weigh in as I don't add any meds without ECIR suggestion, thanks.