Helping a cat lose weight safely means slow, planned change guided by your vet — a measured amount of an appropriate food, more daily play, and regular weigh-ins. Crash diets are dangerous for cats: rapid weight loss can trigger a serious liver condition (hepatic lipidosis). Never restrict food sharply without veterinary guidance.
Start with your vet, not the food bag
Before changing anything, your vet should:
- Confirm your cat actually needs to lose weight (hands-on body condition score)
- Rule out medical causes and set a target weight and pace
- Tell you how much of which food to feed
This guide helps you carry out that plan and track it — it does not replace it, and it does not set calorie targets for your cat.
The safe basics
- Measure meals. Use a scale or measuring cup so "a bit less" becomes a consistent amount your vet recommended.
- Cut treats and table scraps or count them in the daily amount your vet set.
- Play every day. Short, frequent play sessions (wand toys, chase games) add activity most indoor cats miss.
- Make food work harder. Puzzle feeders slow eating and add movement.
- Weigh on a schedule. Same scale, same time of day, roughly weekly — and record every result.
What to avoid
- Starvation or crash dieting — dangerous for cats, especially overweight ones
- Unplanned "just feed less" guesses without a veterinary target
- Dog-style exercise expectations — cats lose weight mostly through diet and play, not long walks
- Switching foods overnight — transition gradually over several days
Track the trend
Weekly weigh-ins tell you whether the plan is working. The PetsLately Weight Tracker shows the mathematical change between weigh-ins — bring the printout to your vet so they can adjust the plan with real numbers.
When to contact your vet promptly
- Your cat stops eating or eats far less than usual — this is urgent in an overweight cat
- Weight drops very quickly
- Vomiting, lethargy, or yellowing of the eyes or gums
- You're not sure the plan is working
Unplanned weight loss is a different situation entirely — don't assume it's a diet success; have your vet check it.
This guide supports a plan made with your veterinarian. It does not provide calorie prescriptions or diagnose any condition.