What Is Hypothyroidism in Dogs?
Hypothyroidism occurs when the thyroid gland doesn’t produce and secrete enough thyroid hormones. The thyroid gland is located in the mid-neck region near the voice box (larynx). In dogs, the thyroid gland is made up of two separate lobes that lie on either side of the windpipe (trachea). Thyroid hormones play a big role in metabolism and affect the function of many parts of the body.
Hypothyroidism is a common hormone imbalance in dogs and is usually caused by inflammation or shrinkage of the thyroid gland. This progressive destruction of the gland leads to diminished thyroid function and insufficient levels of thyroid hormones. Hypothyroidism is typically seen in middle-aged to older dogs and occurs more commonly in medium to large breed dogs.
Source: Food and Drug Administration (FDA)