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"Hypothyroidism occurs most frequently in large, middle-aged dogs of either gender and of any breed or mixed breed.  The symptoms of hypothyroidism are often nonspecific and quite gradual in onset, and they frequently vary based upon the dog\u2019s breed and age at the time of onset of thyroid hormone deficiency.  Although the signs of hypothyroidism can be subtle, most affected dogs have one or more of the following symptoms:"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Hypothyroidism/Symptoms.aspx>