Megabite -- My dog with hypothyroidism passed away a few years ago. She lived with the thyroid issue for over 10 years after her diagnosis. Later in her life she was diagnosed with diabetes and Cushings Disease, so she had a lot of issues. I initially gave her prescription meds for the thyroid (was many years ago, and I didn't know about iodine). Then I researched and started her on Thytrophin PMG, which is bovine thyroid extract. That actually regulated her thyroid levels much better than the medication.