How to Transition Your Cat to a New Diet
Article
Why Is a Gradual Transition Important?
Cats can be sensitive to changes in their food, especially when it comes to aroma and texture. But there’s more to it than just fussiness. Your cat’s digestive system is home to billions of bacteria, their gut microbiome, which are specifically adapted to the proteins, fats, and fibres in their usual food. A sudden change can disrupt this delicate balance. This can lead to digestive upset such as diarrhoea, soft stools or vomiting.
Cats are also obligate carnivores with a narrow digestive tolerance. Even slight changes in ingredients or formulation, combined with the stress of change, can result in a digestive upset. That’s why a gradual transition is so important: it gives your cat’s gut microbiome time to adapt, while also allowing them to get used to the new sensory experience, the smell, texture, and flavour, making it more likely they’ll accept and enjoy their new diet.
How to Transition Your Cat’s Food
The key is to go slow. Here’s an ideal seven-day transition plan:
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Days 1–2: Serve 75% of your cat’s current food and 25% of the new food.
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Days 3–4: Offer a 50/50 mix of the old and new foods.
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Days 5–6: Move to 25% old food and 75% new food.
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Day 7: Serve 100% of the new food.
If your cat is particularly resistant, don’t rush. You can extend each stage, spending longer on a split ratio (such as 75/25) until your cat is comfortable. Some cats may also prefer the new food to be served in a separate bowl, rather than mixed. Introducing wet food alongside dry can also help encourage your cat to try the new diet.
Make sure fresh water is always available nearby to encourage hydration, especially if you’re feeding dry food.
Dr Annabel Robertson, Royal Canin
Tips for Encouraging Acceptance
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Warm Wet Food: Warming wet food to around 38°C (close to body temperature) can make it more appealing and enhance the aroma. This mimics the warmth of natural prey and can stimulate your cat’s appetite.
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Favourite Bowl: Some cats are very particular about their bowls. Offering the new food in the familiar bowl can help ease the transition. If your cat is especially fussy, try serving food on a flat plate rather than a deep bowl. Some cats dislike their whiskers touching the sides of a bowl, a phenomenon known as “whisker fatigue”, and a shallow dish can make eating more comfortable.
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Serve Foods Separately: Place both the old and new foods side by side, gradually increasing the portion of the new food while decreasing the old over several days. This allows your cat to get used to the new taste and texture at their own pace.
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Persevere: Some cats may take a tentative nibble and then walk away, returning later when they feel more comfortable. Patience is key and some cats may need a transition over 10-14 days.
The Importance of Feeding Environment
Cats are sensitive to their surroundings when eating, often preferring a quiet, calm spot away from noisy children, other pets, or household bustle. This peaceful environment is especially important when transitioning to a new diet, particularly if your cat needs a special food due to illness. A common mistake is to feed a cat near its litter tray, but this should be avoided as it can discourage eating.
Dr Annabel Robertson
When to Be Concerned
Always keep an eye on your cat’s wellbeing during the transition. If you notice any gastrointestinal issues, such as vomiting or diarrhoea, consult your veterinarian. They are best placed to help you adjust the plan to suit your cat’s needs.
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