Hyperthyroidism is the most common endocrine disorder in older cats. Multiple treatment options exist and understanding their welfare implications helps informed decision-making.
Feline hyperthyroidism treatment choice involves welfare considerations at multiple levels. The disease itself causes significant welfare compromise through weight loss, muscle wasting, hypertension causing potential blindness and heart disease, and the distress of chronic restlessness. All effective treatments can restore good quality of life, but the welfare of the treatment process varies. Daily medication requires twice-daily pilling or application that many cats find stressful, with periodic blood monitoring under restraint. Radioactive iodine involves a period of boarding at a specialist facility that stresses some cats but achieves permanent cure. Surgical risks must be carefully weighed in older patients. Owner capacity and the individual cat's temperament should both inform treatment selection.