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Snickers is starting to gain too much weight, can I start feeding him adult cat food?

Important Disclaimer

The information provided here is for general pet health education only and is not a substitute for professional veterinary advice, diagnosis, or treatment. Never disregard professional veterinary advice or delay seeking it because of something you read here. If your pet is experiencing a medical emergency, contact your veterinarian or an emergency animal hospital immediately.

S
Snickers
Registered pet
Species & breed
Cat · Siamese
Age
9 months old
Sex
Male
Color
Black & Tan

It's great that you're keeping an eye on Snickers's body condition — that kind of attention really does make a difference in the long run! That said, at 9 months old, Snickers is still very much a kitten, and this is an important time for his development.

Why kitten food still matters right now

Kitten formulas are specifically designed to support rapid growth — they have higher levels of protein, fat, and key nutrients like calcium and phosphorus that a young cat's body needs to build strong muscles and bones. Switching to adult food too early can mean Snickers misses out on those building blocks during a critical window.

What might be causing the weight gain?

A little extra roundness in a growing kitten isn't always a problem, but if you're genuinely concerned, a few common factors are worth considering:

  • Overfeeding: Kitten food is calorie-dense by design. Free-feeding (leaving food out all day) can lead to overeating.
  • Treats: These can add up quickly and are easy to overlook.
  • Activity level: Indoor kittens sometimes don't get enough play and movement.

What you can try at home

  • Switch from free-feeding to scheduled meals (typically 2–3 times a day for a kitten his age).
  • Measure portions carefully using the feeding guide on the food packaging as a starting point.
  • Increase interactive play — wand toys, laser pointers, and puzzle feeders are great for burning energy.
  • Hold off on extra treats for now, or count them as part of his daily food allowance.

The good news is that most cats naturally lean out a bit as they approach adulthood (usually around 12 months), so what you're seeing now may partly just be normal kitten "chunkiness."

When to see your vet:

Schedule a visit soon — ideally within the next few weeks — so your vet can weigh Snickers and assess his body condition score (a standardized way vets measure whether a pet is at a healthy weight). If your vet confirms he's gaining too much, they can guide you on whether to adjust portions, switch to a lower-calorie kitten food, or time a transition to adult food appropriately. Don't switch to adult food on your own before that conversation, as it could shortchange his development at a key stage.

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