Thyroid carcinoma in dogs is often advanced at diagnosis, but treatment options including surgery, radiation, and radioactive iodine provide meaningful welfare improvement.
Thyroid carcinoma causes welfare compromise through both local mass effects — dysphagia, dysphonia, respiratory compromise — and systemic effects of excess thyroid hormone if the tumour is functional. Treatment improves welfare through mass reduction and hormonal normalisation. Surgical removal of mobile tumours provides immediate relief from compression symptoms. Radioactive iodine offers systemic treatment for metastatic disease with relatively low immediate treatment-related welfare burden. Palliative care maintains quality of life in non-resectable cases.