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What food should my 8-month-old fixed kitten eat to avoid weight gain?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 7 months and 22 days old

My kitten is almost 8 months and he was just fixed a week ago, is it better to start feeding him adult cat food now so he doesn’t gain too much weight? Or should I continue feeding him kitten food until he is a year old. Thanks(:

3 Answers

Most Helpful Answer

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Answered By Daniela Jessen, DVM

Veterinarian

Published on January 13th, 2018

After neutering, generally at the age of 6 months, in Leo's case 8 months, cats are still growing not yet reached their full size till around 12 months of age. For now I would recommend to stick to a good quality kitten food till a year old. But, many young cats gain weight beyond what they should gain after neutering so watch him if he is gaining more weight then he should then talk to your vet about adult cat food, some are specific to castrated/spayed young cats.

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    Answered By Sarah Box, BVSc

    Veterinarian

    Published on June 8th, 2017

    Mars is such a cute fluff ball!! At 11 months and 11lb I think it would be safe to switch Mars to a good quality Adult cat food. Be sure and transition him onto the new food over 7-10 days to help prevent an upset tummy. And also measure out his food each day to be sure he isn't eating too much. I would recommend a weight check every month or so to be certain he is not getting overweight. It can be very difficult to visually monitor weight in fluffy kitties, so regular weigh-ins and hands on exams are important. Ideal weight would mean that you can just palate Mars' ribs and pelvis bones, and he still has a nice defined waist when you run your hands down his sides/back. Regarding his behavior-biting behaviors certainly should not be encouraged, a cat bite can be a very a serious thing with the possibility of significant infection. Any time Mars seems like he wants to bite I would redirect him onto a toy that he can play with. And never play with him with your hands, which it sounds like you don't, as this will just encourage his biting and aggressive behavior. Good luck with Mars-he is a handsome boy!

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    Answered By Lauren Jones VMD

    Veterinarian

    Published on March 24th, 2017

    Hi Ashley! I typically prefer keeping all growing cats on kitten food until they are 1 year old. Since Mars seems to be gaining too much weight on the kitten food, consider cutting back on his portion rather than switching to adult food. There is no need to worry about feeding some adult food tonight. Simply go back to kitten food tomorrow and hang onto his adult food in a sealed container for a few more months. When possible, Mars should be fed 2 meals per day. Use the chart on his bag of food to get a sense for how much he should eat based on his weight (use his ideal body weight rather than his current weight since he is overweight) and age. Strictly control how many treats he receives and avoid any table food, as these tend to be the biggest culprits in weight gain.

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