Treatment
Treatment involves synthetic thyroid hormone supplementation with medications such as sodium levothyroxine. Oral supplementation generally will be given daily for the remainder of the dog's life. Frequent re-examinations by the veterinarian will be needed to evaluate the blood levels of the thyroid hormone to be sure that the appropriate dose is being given. When too much hormone supplementation is given, a condition called thyrotoxicosis can occur. This condition, which is quite uncommon, may result in clinical signs such as panting, nervousness or anxiety, weight loss, diarrhea, increased drinking and increased urinating, aggressive behavior, and increased appetite.