How feline hyperthyroidism can be managed through both medical treatment and dietary iodine restriction, improving welfare in older cats.
Feline hyperthyroidism causes significant welfare harm when uncontrolled. Affected cats lose weight and muscle mass despite increased appetite, experience cardiovascular changes including hypertension and cardiac hypertrophy, and often become restless and anxious from the metabolic acceleration of the condition. Treatment dramatically improves welfare — most cats become calmer, regain weight, and show obvious improvements in comfort after their thyroid hormone levels normalise. The choice of treatment method (methimazole, radioactive iodine, or dietary iodine restriction) depends on individual cat factors and owner preference, but all three can achieve effective management and genuine welfare improvement when used appropriately.