Hypothyroidism is a hereditary condition. The thyroid gland does not make enough thyroid stimulating hormone (TSH), which can affect the dog's overall condition. Hypothyroid dogs tend to have poor coats, be lethargic, seek heat, be overweight, and have problems with fertility. The thyroid gland affects many bodily functions and has been proven to be closely related to the immune system. Dogs that have low thyroid function may also experience a host of other problems throughout life, unless effectively treated. Aggression has also been linked to low thyroid function.
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Testing for Hypothyroidism:
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The only way to know your dog's true thyroid function is to have a complete panel run by a qualified lab (Michigan State, Antech, Guelph). These labs test for levels of T4, T3, TSH, Free T4 and Free T3. Most veterinary in house testing is only for T4, and this is not an adequate indicator of thyroid function. Testing should be done annually, as the disease can come on later in life. Hypothyroidism is treated by giving thyroid hormone replacement pills a couple of times per day. Once started, however, the dog will have to stay on this treatment for the rest of his life.
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