Switching Your Cat to a New Food Safely: The 7 to 10 Day Plan
Cats do not always welcome a new food, and their stomachs often like change even less than they do. Swap the bowl overnight and you may get a refused meal, a loose stool, or a cat who vomits and then will not trust the new food at all.
A slow switch over 7 to 10 days avoids most of that. It gives your cat’s digestion time to adjust, and it gives a picky cat time to get used to a new smell, taste, and texture.
Before you start
Pick one new food from the Shop and stick to that plan. Do not rotate through three new foods in the same week to see which one sticks. If something upsets your cat, you will not know which food caused it.
Check that the new food suits your cat’s life stage and is complete and balanced for daily feeding. If your cat has a medical condition, kidney or urinary issues, allergies, diabetes, or is on a prescription diet, talk to your vet before switching. The schedule below is general guidance for healthy cats, not medical advice.
Keep the old food on hand for the full transition. Running out on day three forces a sudden switch, which is what you are trying to avoid.
The 7 to 10 day transition schedule
Feed the same total daily amount as usual. You are changing the mix, not adding extra food on top.
Days 1 to 2: About three-quarters old food, one-quarter new food.
Days 3 to 4: Half old food, half new food.
Days 5 to 7: About one-quarter old food, three-quarters new food.
Days 8 to 10: All new food.
Some cats need longer. A cat with a sensitive stomach, or a very fussy cat who has eaten the same food for years, may do better over two weeks, holding each step for an extra day or two. That is fine. The schedule is a guide, not a deadline.
Portion basics by weight
The new food may have a different calorie count from the old one, so the same scoop may no longer be the right amount. Check the feeding guide and calorie count on the new label before day one.
As a rough starting point only, many average adult cats are fed a daily amount in this range, split across two meals:
- Around 6 to 8 pounds: roughly 3/4 to 1 cup of dry food a day in total, or about one standard can of wet food plus a small amount of dry, depending on the product.
- Around 8 to 12 pounds: roughly 1 to 1 and 1/4 cups of dry food a day in total, adjusted up or down for activity.
- Over 12 pounds: follow the label guide for their weight carefully, and be careful not to overfeed — a larger cat is not always a cat who needs a lot more food, especially if they are already carrying extra weight.
These are only ballpark figures. Calorie counts vary a lot between brands and recipes, so the label on your specific food comes first. Kittens, pregnant or nursing cats, and very active outdoor cats need more than these adult indoor ranges.
If you are unsure what your cat should weigh or eat, your vet can give you a target based on your cat’s body condition, which is more useful than weight alone.
Signs to slow down
A mild change in stool for a day as the mix changes is common. These signs mean you should slow the transition, go back a step, or pause:
- Loose stools or diarrhoea that lasts more than a day or two, or keeps coming back at the same step.
- Vomiting more than once, or vomiting that continues after you return to the previous mix.
- Refusing the new mix but happily eating the old food on its own.
- Eating much less than usual, hiding, or seeming unusually tired.
- Excessive scratching, ear shaking, or new skin irritation after the change.
If you see these, go back to the last mix your cat handled well and stay there for a few days before trying the next step again. Slowing down fixes a lot of simple transition problems.
Stop the switch and call your vet promptly if your cat stops eating altogether, vomits repeatedly, has diarrhoea that does not settle, seems in pain, or if you have a kitten, senior, or unwell cat who goes off food. Cats who do not eat for a day or more need prompt attention, especially if they are overweight.
Tips for picky cats
Serve meals at set times rather than leaving the new mix out all day. A fresh portion at a regular time is more appealing than food that has sat around.
Sometimes a food simply does not suit a cat. If you have gone slowly, tried twice, and your cat still refuses it or does not do well on it, pick a different complete food from the Shop and start again slowly. That is not a failure — it is useful information about your cat.
A careful switch takes a little patience, but it is one of the easiest ways to avoid an upset stomach and a wasted bag of food. Small steps, steady portions, and attention to how your cat is doing will get most cats onto a new food without any drama.
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