Hypothyroidism
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The thyroid gland performs a variety of functions, but is probably best known for its effect on regulating metabolism. Common in dogs and humans, hypothyroidism occurs when a dog's or person's body isn't producing enough thyroid hormone. In dogs this causes a wide variety of chronic symptoms, including lethargy, hair loss, a dull coat, skin problems, weight gain, obesity, anemia, high cholesterol and even a slowed heart rate or abnormal heart rhythms. As with humans, the symptoms are vague enough and non-specific enough that it's common for a dog to have the condition for several years before being diagnosed and treated. [...]