>The thyroid is a two-lobed gland located in the neck of people, dogs, cats and other animals, one lobe located on each side of the trachea (windpipe). The thyroid produces thyroid hormone, a substance that is transported via the blood to every cell in the body. The primary function of thyroid hormone is to control the rate at which cells function: too little causes cell function to slow down. Low thyroid function (hypothyroidism) is relatively common in dog and is rare in cats. Excess thyroid function (hyperthyroidism) is rare in dogs but is one of the most common diseases diagnosed
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