Details
Hypothyroidism is a multi-systemic disorder resulting from deficient production thyroid
hormone. Thyroid hormone regulates metabolism, and therefore, affects almost
every system in the body. Hypothyroidism is a very common endocrine disorder
that affects middle-aged dogs. Genetics can play a role in the development of
hypothyroidism.
Common
signs are weight gain despite limited food intake, lethargy, weakness,
poor skin coat (dull or dry coat, oily skin, scales), hair loss or slow hair
regrowth, ear and skin infections, cold intolerance, diarrhea, constipation,
fatty deposits in the eye, and occasionally seizures. Clinical signs are slow to
develop and are only evident when 75% of the thyroid gland is not functioning.
It
is diagnosed by a blood test to measure the level of thyroid hormone. Other
blood tests may be performed to evaluate other body systems since concurrent
diseases such as Cushing's disease (characterized by an abnormal production of
steroids) or Diabetes can cause low levels of circulating thyroid hormone.
However, controlling these disease processes usually eliminates the need for
hypothyroidism treatment. Other systemic illnesses such as kidney and liver
insufficiency, heart failure, or immune system disorders can falsely lower
thyroid levels and this phenomena is known as euthyroid sick syndrome.
Treatment
Overdose
of thyroid hormone can result in panting, nervousness, increased thirst
and urination, increased appetite and weight loss. If you should notice any of
these symptoms, please contact your vet so the dose of your pet's medication can
be adjusted.
