Hypoallergenic Cat Food
15 productsFind vet-recommended hypoallergenic cat food for a cat reacting to something in their diet.[more] Novel-protein and hydrolysed diets that avoid the trigger behind a food allergy and let the skin settle. Browse allergy-friendly ranges from Royal Canin, Hill's and Purina Pro Plan.
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Signs your cat may have a food allergy
A food allergy in cats usually shows on the skin rather than the stomach, as year-round itching around the head, neck and ears, over-grooming, or the scabby bumps vets call miliary dermatitis.
It can come with loose stools too, but the year-round pattern is the clue that sets it apart from seasonal environmental allergies. A food allergy is a less common cause of itching than fleas, so a hypoallergenic diet is not the first thing to try, but the step you take with your vet once fleas and other skin causes are ruled out.
How hypoallergenic cat food works: novel protein vs hydrolysed
Hypoallergenic cat diets take one of two approaches, both aimed at avoiding the protein a cat is reacting to:
- Novel protein diets are built on a single protein the cat has never eaten, so the immune system has nothing to react to. As an obligate carnivore, a cat needs that protein to be a genuine, complete meat source.
- Hydrolysed diets break the protein into pieces too small for the immune system to recognise, which sidesteps the guesswork of finding a novel protein.
Both are used within an elimination trial to identify the trigger, then to avoid it long term once known. Each comes as hypoallergenic dry cat food or hypoallergenic wet cat food, so you can match the format to a fussy cat.
For what to look for on the label, see our guide to cat food ingredients.
How to run an elimination diet for a cat
An elimination trial means feeding only the hypoallergenic diet for around eight weeks, with absolutely nothing else, then reintroducing the old food to see if the signs return.
The hard part in cats is control: a cat that roams, hunts or helps themselves to another pet's bowl can undo the trial without you knowing, so indoor cats are far easier to keep honest. Flavoured treats, dental products and even some medications can break it too. Because it is easy to get wrong, run the trial with your vet, who will confirm the result and help you land on a diet you can feed for good.
Hypoallergenic vs skin-support cat food: the difference
A hypoallergenic diet avoids a specific protein for a food allergy, while a skin-support diet is an everyday, omega-enriched food for sensitive skin that is not driven by food.
A skin and coat support diet helps the skin barrier of a cat whose sensitivity is not food-related. If your cat is itchy but food has not been pinpointed as the cause, a skin-support diet or an omega supplement may be the better fit, and your vet can help you choose.
Trusted hypoallergenic cat food brands
- Royal Canin: hydrolysed and selected-protein veterinary diets for cats.
- Hill's Prescription Diet: hydrolysed and sensitive diets developed and trialled with vets.
- Purina Pro Plan: veterinary hydrolysed and sensitive-skin cat diets.
Hypoallergenic veterinary diets are chosen and started on your vet's recommendation, since they are matched to a diagnosis rather than picked from a shelf.
Frequently Asked Questions
Yes, a cat can develop a food allergy at any age, even to a protein it has eaten happily for years, because an allergy builds with repeated exposure rather than on first contact. It tends to show as year-round itching around the head and neck, over-grooming or scabby skin, sometimes with loose stools. A vet-guided elimination diet is how it is confirmed.
The most common triggers are the proteins cats eat the most, chiefly beef, fish, chicken and dairy, while grains are a rare cause in cats. A cat reacts to a specific protein it has eaten before, so there is no single culprit for every cat. The trigger is identified with an elimination diet, not a blood or saliva test, which are unreliable for food allergy.
Hypoallergenic cat food works when it is used properly: a hydrolysed or single novel-protein diet fed strictly as the only food during a vet-guided trial. It will not work if other foods, treats or a roaming cat's scavenging undo the trial. Fed correctly, it lets the skin settle and, once the trigger is known, keeps the allergy managed long term.
Most cats improve over an eight-week elimination trial, with the skin often easing in the second half rather than the first week, because skin turns over slowly. Any digestive signs may settle sooner. Your vet confirms the result by reintroducing the old food to see whether the itch returns.
It is best not to, because these diets are designed to be used within a vet-guided elimination trial, and casually feeding one gives you the cost without the diagnostic benefit. Your vet supervises the trial and interprets the reintroduction that confirms the allergy. They also make sure a novel-protein diet stays complete for an obligate carnivore.
