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Thyroid cancer in dogs (thyroid carcinoma) is the most common cause of hyperthyroidism in dogs.
The cancer is in the form of a tumor (also called a neoplasm which means abnormal cell growth). Hyperthyroid problems only occur in 10% of dogs that have canine thyroid cancer.

Thyroid tumors in dogs are usually fast growing and large. The only breed that has an above average incidence for this problem is the Labrador Retriever.

Iatrogenic hyperthyroidism is also sometimes seen (although rare still) -which is when the condition is caused by a therapy or medication.   

Hyperthyroidism is not common in dogs.

Symptoms of Hyperthyroidism in Dogs


  • Weight loss
  • Increased appetite
  • Increased heart rate
  • Treatment of canine hyperthyroidism includes surgery followed by chemotherapy and radiation. Survival after treatment depends on the size and the rate of growth of the tumor. This is one of the thyroid problems in dogs that is a very serious disease with short survival times.


References for Thyroid Problems in Dogs:
The Mechanic's Guide to Your Patient's "Idle System": Thyroid Disease Reviewed
K.K. Faunt
The Pet Hospital, Portland, OR, USA.

Thyroid Study in Welsh Springer Spaniels
Colleen M O'Keefe, DVM, MS

Canine Hypothyroidism
Reto Neiger, Prof. Dr.med.vet.
Small Animal Clinic, Justus-Liebig University Giessen, Germany

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