Symptoms of Canine Hyperthyroidism

Dogs of any breed, age or gender can be affected by hyperthyroidism.

Although uncommon in dogs, hyperthyroidism is a condition in which the thyroid gland produces excessive amounts of hormones. Symptoms begin appearing in dogs between 4 and 6 years of age. The excessive hormone production can result in unwanted symptoms in the affected dog that should be treated to prevent more serious illnesses or conditions.

Weight Loss

One of the most common signs of canine hyperthyroidism is weight loss. Hyperthyroidism increases the dog's metabolism, causing him to lose weight.

Heart Rate

Dogs with hyperthyroidism can also have an elevated heart rate, which can become a serious issue if left untreated.

Appetite

Due to the elevated metabolism caused by hyperthyroidism, many dogs with the disorder will display an increase in appetite.

Changes in Behavior

Hyperthyroidism causes the thyroid hormones T3 and T4 to be produced in excessive amounts. These elevated hormone levels can alter the behavior of an affected dog. Dogs with hyperthyroidism may show signs of hyperactivity, nervousness and increased water consumption and urination.

Treatment

Thyroid cancer is the most common cause of hyperthyroidism in dogs. Surgery is necessary to remove tumors, along with chemotherapy and medications such as methimazole (Tapazole) to control hyperthyroidism.

References

• Thyroid Problems in Dogs
• Hyperthyroidism in Dogs
• Canine Hyperthyroidism