Hypothyroidism (Low Thyroid Function)


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Canine Hypothyroidism is the most commonly diagnosed hormonal disease found in dogs. The term hypothyroidism simply means the underproduction of thyroxin, the hormone produced by the thyroid gland.

The thyroid gland is located on the trachea (wind pipe) of the dog, just below the voice box. It exerts its influence on the dog's body by producing and releasing thyroxin into the blood stream. This hormone, and thus, the thyroid gland itself, is very important in controlling growth and development and maintaining normal protein, carbohydrate and lipid metabolism of the dog.

Hypothyroidism usually occurs between the ages of two to six years. The most common sign is an increase in body weight. Lethargy and some form of skin disease (i.e., thin coat, loss of hair, dandruff, oily skin, increased scratching) are also common signs of Hypothyroidism.

The treatment is through thyroid hormone supplementation given orally once or twice a day. Usually thyroid supplementation improves the clinical signs associated with the disease within four to six weeks. All the clinical signs of hypothyroidism are reversible, once treatment is started.

Additional Information:

~ Hypothyroidism — from The Great Dane Club of America
~ Hypothyroidism — Mar Vista Animal Medical Center
~ General Thyroid Information — OFA
~ OFA — Orthopedic Foundation for Animals


Note: This section of Canada's Guide to Dogs is intended as a source of information only. It is not intended as a substitute for professional care. Always consult with your Veterinarian about health related matters.


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Last Updated: 7 May 2004

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