Weight loss in older cats is often a sign of serious underlying disease and should prompt thorough veterinary investigation rather than being accepted as normal ageing.
Weight loss in older cats is rarely benign and most often reflects an underlying condition causing welfare harm that can be improved with treatment. Cats that are losing weight are typically experiencing inadequate caloric intake or absorption, which impairs energy, immunity, and quality of life. Many owners accept gradual weight loss as normal ageing without investigation, delaying treatment of conditions that respond well to early intervention. Hyperthyroidism is highly treatable; CKD can be managed for extended periods; dental disease is resolved by appropriate dental treatment. Thorough investigation saves suffering by enabling targeted treatment.