Feline obesity

Symptoms an owner can spot at home

• Body condition score (BCS) ≥ 6/9—ribs hard to feel, no waist when viewed from above
• Pendulous abdominal fat pad that swings when walking
• Reduced grooming, especially over the spine and tail base—matting and dander follow
• Reluctance to jump up; landing heavily or refusing previous perches

When to see a vet

• Before starting any weight-loss plan—feline weight loss must be slow and supervised
• Any cat that stops eating for more than 24–48 hours during a diet—risk of hepatic lipidosis
• Polyuria, polydipsia, or sudden ravenous appetite—screens for diabetes mellitus
• Difficulty breathing or open-mouth panting at rest

What it is

Feline obesity is now recognised as a chronic disease by AAHA and WSAVA. Excess adipose tissue drives insulin resistance—obese cats are roughly four times more likely to develop diabetes mellitus—and contributes to osteoarthritis, urinary disease, and reduced lifespan. The 9-point BCS scale applies: 4–5/9 ideal, 6–7/9 overweight, 8–9/9 obese.

The single biggest hazard in feline weight loss is hepatic lipidosis. Cats that stop eating mobilise fat to the liver faster than they can process it; in obese cats this can become fatal within days. This is why crash diets, free-feeding interruptions, and "just leave the new food and they'll eat when hungry" all carry real risk in cats specifically.

How vets diagnose it

Diagnosis is the BCS plus a weight history. Vets calculate a target weight, then a daily calorie target—typically 80% of the resting energy requirement (RER) of the target weight. Bloodwork screens for diabetes, thyroid, and liver issues. Plans are conservative: ~0.5–1% body weight loss per week is the safe ceiling, with monthly weigh-ins.

Treatment overview

Editorial overview only—your vet builds the plan. Effective feline weight loss combines: a measured daily calorie allowance (gram-weighed); a therapeutic weight-loss diet (typically high-protein, controlled-carbohydrate); meal feeding rather than free-feeding; environmental enrichment to break the boredom-eating cycle; and gradual increases in activity through play and food puzzles. Crash diets are unsafe.

What buyers can do

• Switch from free-feeding to measured meals. Weigh in grams; cups routinely over-deliver calories.
• Use food puzzles, lick mats, and snuffle mats to slow intake and add foraging enrichment without extra calories.
• Provide vertical territory—cat trees, window perches, shelf paths—to encourage low-impact climbing.
• Schedule two short interactive play sessions a day with a wand toy; chase mimics hunting and burns more calories than passive toys.
• Never withhold food abruptly. If a cat refuses the new diet for more than 24 hours, contact the vet—hepatic lipidosis risk.