As pets get older, they may gradually lose a couple of pounds. But if you notice sudden or significant weight changes, it’s important to speak to your vet to identify the cause.
In cats aged seven-plus, weight loss coupled with a good or even increased appetite can be a sign of hyperthyroidism (an overactive thyroid gland). If you notice these symptoms in your cat, call your vet straight away. While a good recovery is possible through treatments such as surgery or medication, the condition can cause complications and organ damage if it’s not addressed early enough. Other causes of rapid weight loss in cats may be due to a parasite, or kidney or liver disease – so it’s best to book a check-up as soon as you can. But keep in mind that weight loss could also be due to something that is quite easily treated, such as a short-lived infection.