Hyperthyroidism is the most common endocrine disorder in older cats, affecting an estimated 10% of cats over ten years old. Managing this condition involves complex welfare decisions about treatment, quality of life, and end-of-life care.
Hyperthyroidism in cats illustrates the complexity of veterinary welfare decisions. The unmasking effect means that successful treatment may reveal kidney failure that was previously masked — confronting owners with a cruel paradox where the cat felt better when untreated. Welfare-centred veterinary care involves ongoing quality-of-life monitoring, honest conversations about prognosis, and willingness to prioritise comfort over longevity when the cat is suffering. The increasing use of structured quality-of-life tools helps owners make these difficult decisions with clearer information.