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Although our feline companions can suffer from hyperthyroidism, the majority of dogs with thyroid problems will have the opposite condition — hypothyroidism.
Hypothyroidism occurs when the thyroid glands do not produce enough thyroid hormones. If a dog is hypothyroid, there is a very slim possibility that a tumor is present. However, in most cases, it is simply a dysfunctional thyroid gland.
As with feline hyperthyroidism, the signs of canine hypothyroidism vary widely, but the most common are weight gain, hair loss or poor haircoat, rough or scaly skin and lethargy. Breeds particularly at risk for this disease include Doberman Pinschers, Labrador Retrievers, Golden Retrievers and Great Danes.
Contact your veterinarian if your pet is exhibiting any of the following signs:
His affection for chasing balls slows down, and he lags behind on walks.
He sleeps more than usual.
He seems to be putting on weight.
In some dogs, thyroid tumors are the cause of the thyroid imbalance. The tumor is often found by palpation first. The owner may notice a swelling in the dog’s neck, or the veterinarian might discover it during a routine physical.
The thyroid glands are located on each side of the dog’s trachea. If only one thyroid gland becomes cancerous, the dog may have normal thyroid production and only exhibit a mass in the neck. If left unchecked, the lump can grow quite large and can invade the neck muscles, larynx, esophagus or even the lungs. Signs may include a cough or problems swallowing. Fortunately, only one gland is usually compromised by the tumor, and some thyroid tumors can be removed.
Canine hypothyroidism can be a subtle disease. Signs appear gradually and dog owners may mistake their dog’s lethargy, weight gain and inactivity for signs of aging rather than hypothyroidism.
Dogs with hypothyroidism are typically middle aged. Seven years is the average age of onset, and testing dogs with clinical signs is essential.
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