One function of the thyroid hormones is to regulate metabolism. Hypothyroydism is a failure in the complex system involved in the release of these hormones or, more usually, the thyroid gland itself. A common symptom of hypothyroidism is weight gain and obesity. Diagnosis is simple by a blood test and treatment is given by synthetic hormones for the duration of the dogs life.
Golden Retrievers are prone to this condition but you have to ask why did this dog get to such a size before help was sought? People,eh? Hope this answers your question.
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