Direct answer: yes. Rapid or unexplained weight loss can be dangerous and may signal illness, so do not sharply restrict food without a veterinary plan.
Separate planned loss from unexplained loss
A vet-supervised programme has a target, suitable diet and review schedule. Weight falling when no diet was intended is a reason to contact the practice.
Measure all food honestly
Record meals, treats, scavenged food and what each cat eats in a shared home. Do not replace complete food with vegetables or human diet products.
Keep follow-up appointments
The rate and target must suit the individual. Report reduced appetite, vomiting, diarrhoea, increased thirst or behaviour changes promptly.
A practical furniture note: Kitty Buffet can support this routine where its current specifications suit your cat and room. Product furniture cannot diagnose or treat a health or behaviour problem.
