Thyroid tumours in dogs are predominantly malignant carcinomas that cause progressive welfare impairment through local invasion and metastasis, with surgery, radioiodine, and chemotherapy offering management options.
Canine thyroid carcinomas cause welfare harm through both local effects and metastatic disease. Local invasion can compromise the airway and esophagus, causing difficulty breathing and swallowing that progressively worsens. Early surgical intervention for mobile, resectable masses offers the best welfare outcome — delays allow local invasion that makes surgery more hazardous and less curative. The decision-making framework for thyroid tumour management should balance realistic survival expectations against treatment burden — some dogs are better served by palliative management that prioritises quality over quantity of remaining life. Referral to a veterinary oncologist for staging and treatment planning is appropriate for most canine thyroid tumour cases.