Overview of Thyroid Health In Canine
What is the canine thyroid gland? The canine thyroid gland is composed of two parts, or lobes, each located in the front of the neck along the windpipe (or trachea). Thyroid hormones are responsible for maintaining a healthy metabolism, allowing all the body's organs to function normally.
Canine Measurement of free-T4 may be useful in differentiating dogs with true hypothyroidism from dogs with reduced thyroid function due to other chronic illness (e.g., hyperadrenocorticism, liver disease, diabetes), drug administration (e.g., glucocorticoids), and malnutrition.
Canine Hypothyroidism

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Hypothyroidism is a common endocrine disease of dogs. It occurs when the thyroid glands fail to produce adequate amounts of the hormones thyroxine (T4) and triiodothyronine (T3). Primary hypothyroidism resulting from idiopathic thyroid gland atrophy or immune-mediated lymphocytic thyroiditis is the most common diagnosis. Uncommon causes of canine hypothyroidism include congenital disease ...
The thyroid gland is one of the most important glands in the body, playing a major role in metabolism, growth, and development of the body. In dogs, thyroid disorders are a common health issue.
Dog Thyroid Health

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Clinical Tips Certain breeds and active working dogs are known to have thyroid hormone concentrations that are below standard laboratory reference ranges in the absence of thyroid disease. Therefore, it is essential to consider the patient's breed and purpose when presented with abnormal thyroid hormone concentration results. This is especially important in sighthounds, such as greyhounds or ...
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Here's what to know about the variety of thyroid disease in dogs. Learn about their causes, their symptoms, and how they are treated.
Disorders of the Thyroid Gland in Dogs
However, when hyperthyroidism occurs in dogs, the most likely cause is malignant cancer of the thyroid gland ( thyroid carcinoma). Treatment of thyroid cancer and hyperthyroidism in dogs depends on the size of the tumor, the amount of tissue involved, and the presence of metastasis (spread of cancer to other locations in the body).
The extent of thyroid -stimulating hormone (TSH) deficiency in these dogs is variable, and clinical signs are usually caused mainly by deficiency of growth hormone (rather than thyroid hormone). In cats, iatrogenic hypothyroidism is the most common form.