Hyperthyroidism is characterized by hypermetabolism and high circulating thyroid hormone concentrations. Clinical features include weight loss despite a good appetite. Treatment depends on the underlying cause, but options include surgery, radioactive iodine, antithyroid drugs, and low-iodine diet.
Clinical hyperthyroidism in cats and dogs is produced from excessive secretion of the thyroid hormones T4 and T3, resulting in signs that reflect an increased metabolic rate.
It is most common in middle-aged to old cats but also develops rarely in dogs.
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