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How do I help my overweight cat lose weight safely?

Do it WITH your vet and do it slowly: cats should lose no more than about 1–2% of their body weight per week, because rapid loss (or a cat that stops eating) can trigger life-threatening fatty-liver disease. The plan is measured portions of a vet-chosen weight-management food + daily play + regular weigh-ins — never a crash diet.Professional guidance

Weight loss in cats is a medical process, not a DIY calorie cut. The vet rules out causes, sets the target and calories, and monitors — this page helps you understand and stick to that plan.

Applies to: Overweight adult cats on a vet-supervised plan. Never crash-diet a cat; kittens and pregnant/nursing cats don't diet.

Steps

Start with the vetFact
  • The vet assesses body/muscle condition and rules out underlying conditions before any diet
  • They set the target weight, daily calories, treat allowance, and recheck schedule
  • Don't guess portions — 'a bit less food' is how cats end up losing too fast or not at all
Lose it SLOWLY (the safety line)Fact
  • No more than ~1–2% of body weight per week (many cats start near the lower end)
  • Rapid loss — or a cat that stops eating — risks hepatic lipidosis (fatty liver), which is life-threatening
  • If your cat stops eating or eats much less, PAUSE the diet and call the vet promptly
The plan that worksProfessional guidance
  • Measured portions of a vet-recommended weight-management diet (often higher-protein, lower-carb)
  • Count treats within the calorie budget; use play/enrichment instead of food rewards
  • At least two 10–15-minute play sessions a day (interactive wand toys)
  • Weigh every 1–2 weeks and adjust WITH the vet — up 10% if losing >2%/week, down 5–10% if <1%/week

Normal vs keep-watching

Normal: Steady, slow loss (~0.5–2%/week) toward the vet's target, with the cat eating well throughout.

Keep watching: Weekly/biweekly weight, appetite (the critical one), and body condition — bring the log to rechecks.

When to contact a vet. A dieting cat that STOPS eating or eats much less is an urgent vet matter — pause the diet and call immediately, because reduced intake plus weight loss risks hepatic lipidosis. This page never sets doses or a specific diet; that's the vet's.

What changes this answer

  • Multi-cat home (feed apart so the dieter can't raid — and the others can't be starved)
  • Cat that stops eating (emergency pause + vet)
  • Vet-diagnosed condition (the plan changes)

Common mistakes

  • Crash-dieting or free-feeding 'a little less'
  • No vet plan (losing too fast or not at all)
  • Ignoring a diet-cat that stops eating
  • Treats on top of the calorie budget

Sources

Real questions cat owners ask

  • How fast should a cat lose weight?
  • Why can't cats lose weight quickly?
  • What food helps a cat lose weight?
The weight timeline in This Week is exactly what your vet needs to steer a safe weight-loss plan. Set up your Cat Passport.

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