Hypothyroidism, an under-active metabolism, is seen in dogs while hyperthyroidism, an elevated metabolism, is more common in cats, according to veterinarian Stacey Wallach. Hypothyroid dogs are often overweight, lethargic and intolerant to cold, while hyperthyroid cats usually have weight loss, vomiting and poor hair coat. Medications are available for both illnesses, and surgery and other treatments are also offered for hyperthyroidism.

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