My Tina was diagnosed with hyperthyroidism at the age of 15. Due to her age, I decided to go with medication rather that radiation. There was no way that Tina would take a pill twice a day, so the vet got me together with a mail order pharmacy that would make a tuna-flavored liquid for me. The liquid worked great . She never really put back on any of the weight that she lost, but at least she stopped losing it. She lived for three more years after that in very good health. Unfortunatly, at the same time they diagnosed the hyperthyroidism, they also found out that she had FIV. I had never even heard of it before then. I finally had to say goodbye to her at 18 yrs due to complications of the FIV. I have no doubt that had she not had the added burden of the FIV, she would have continued on several more years on the hyperthyroid medication.