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Somerset Veterinary Hospital

1322 Berlin Plank Rd.

Somerset, PA 15501 US

814-443-1323

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  • Hypothyroidism

Hypothyroidism

  • Created in Pet Health, Chronic Conditions, Pet Health
Image of a dog.

Hypothyroidism is the natural deficiency of thyroid hormone and is the most common hormone imbalance of dogs. This deficiency is produced by several different mechanisms. The most common cause (at least 95% of cases) is immune destruction of the thyroid gland. It can also be caused by natural atrophy of the gland, by dietary iodine deficiency, neoplasia (primary or metastatic) of the thyroid gland or (rarely) as a congenital problem. Hypothyroidism is most common in medium to large breeds of dogs that are middle aged (4 to 10 years) but can occur in any dog.

Hypothyroidism is extremely rare in cats and is most commonly seen in cats following bilateral thyroid removal or radioactive iodine therapy for hyperthyroidism. This is often transient and usually does not require therapy. Rarely cats can have congenital hypothyroidism.

Thyroid hormone serves as a sort of volume dial for metabolism. Since virtually every cell in the body can be affected by thyroid hormone it is not surprising that reduced levels of thyroid hormone can lead to symptoms in multiple body systems. A recent published survey of hypothyroid dogs showed the following percentages of symptoms:

88% had some kind of skin abnormality
40% had hair loss (often on the tail or on both sides of the trunk and flanks ).
22% had skin infections
14% had dry brittle coats with hair that could easily be pulled out
49% were obese
48% were described as lethargic or listless at home
36% were anemic
80% had an increase in blood cholesterol

Hypothyroidism is treated with the oral administration of thyroid hormone, usually given twice daily for the life of the dog. Periodic blood testing is recommended; it is important to know if the medication dose is too low or too high. Thyroid supplement is a safe medication but if it is not given in sufficient doses the patient will not be adequately treated. If the dose is too high excessive water consumption, weight loss, and restlessness can result. Once a pet is started on thyroid supplementation, it is recommended to check a T4 level in two to three weeks, with the blood draw between 4 to 6 hours after the morning dose.Once the correct dose is found, it is recommended to perform a T4 every six to twelve months.

Hyperthyroidism in Cats

This is a very common disease of the middle aged to older cat. A tumor (97% are benign) on the thyroid gland starts producing too much thyroid hormone. Symptoms are usually weight loss in spite of eating well and vomiting. Other signs you might see are diarrhea, a dull and flaky hair coat, and personality changes. This disease usually can be easily diagnosed with a blood test, although occasionally we need a special test called a technesium scan to diagnose the early, borderline cases.

There are three basic methods of treatment: radioactive iodine, surgery, or an oral medication called methimazole (Tapazole). For most cats, the best treatment is radioactive iodine. In 97% of the cases, it is a one-time treatment. The biggest disadvantage is that the treatment needs to be done at a special facility, and the cat needs to be hospitalized for usually 5 to 10 days. In the past, surgery was a common treatment, but it is performed less frequently as the problem seems to recur on the other gland. Treating with Tapazole is also common, but has the disadvantage that it is life long and the cat needs blood tests to monitor the thyroid level and to check for adverse effects.

The disease of hyperthyroidism can actually help the kidneys. If the cat has both kidney disease and hyperthyroidism, it is not a candidate for radioactive iodine and the dose of Tapazole may need to be adjusted. Kidney tests are also monitored when a cat is being treated for hyperthyroidism.

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  • "The staff at Somerset Vet Hospital have been taking care of my "Sophie" for 11 years. They are such caring and wonderful people."
    Karen L.
  • "Thanks for providing great care for my little Tortie, Tallie when she was suffering from her skin allergies. You prompt care and tender kindness was wonderful. Being new to the area I feel very fortunate to have found your practice! Thanks!"
    Nancy
  • ""Doctor Robert Henry, We want to thank you for literally - SAVING OUR BEAUTIFUL DOBERMAN'S (Precious) LIFE. Your excellent diagnostic skills accurately diagnosed our Doberman's condition. Your protocol in treating him have made for a healthy, happy, loving and playful dog. We can never forget what you did for our dog. We cannot thank you enough"
    Kathy & Roger
  • "I came here 6 years ago when they were the only ones who would see my sick pup, and they were the best! They helped my girl get better and provided her years of loving service until we lost her to lymphoma last year. They still take care of my other babies and do an excellent job of doing so! We're patients for LIFE! Thank you guys for ALL you do :) With Love, Gina & The Crew Mountain Pride Pits."
    Gina
  • "I just wanted to take a minute to say how very grateful I am for the entire team at Somerset Veterinary Hospital. I recently had a cat and two kittens spayed/neutered, and they all came through the procedure wonderfully. Dr. Penny is THE BEST!! The vet-techs and front desk girls are always super nice and helpful. I feel good knowing that my 'family' is in good hands when being treated. Thank you all for all you do!!"
    Thomas B.

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