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Food intolerance or allergy in cats

Nutrition needs harmony – a balanced cat diet is vital for our furry friends. To stay healthy and vital, your pet needs:

  • ingredients that are coordinated with each other
  • in addition to muscle meat and offal, also plant-based food (crude fiber), animal and vegetable fat, minerals, trace elements and vitamins


A good dry and wet food covers these areas and provides your cat with optimal nutrition. But what should you do if your cat has the following symptoms despite a balanced diet: coughing, wheezing or sneezing, flatulence or inflamed skin?

These could be signs of an allergy or food intolerance. For you as a cat owner, it is a challenge to interpret the signs correctly, because the symptoms can also occur with other diseases or parasite infestation.

In this article you will learn how to correctly interpret the symptoms, which tests you should perform and how you can help your animal.

Symptoms of food intolerance or allergy in cats

Food intolerance or allergies are the third most common causes of discomfort in cats. They manifest themselves in the same way externally - these include:

  • vomiting or diarrhea
  • Red or inflamed skin
  • flatulence
  • Chronic ear problems
  • Frequent scratching
  • Poor growth in young cats
  • Severe hair loss
  • coughing, wheezing or sneezing
  • Asthma can also be a sign of a food allergy in cats.


Most symptoms often do not appear until a few days later. These so-called delayed reactions make it difficult to determine what caused them.

Questions about food intolerance?

Are you unsure whether your cat has a food intolerance or do you have a question about our products? Our nutritional advice team will be happy to help you.

Intolerance or food allergy: what is the difference?

Clinical symptoms such as frequent scratching, diarrhea or severe hair loss are not sufficient to clearly distinguish a food allergy from an intolerance, as they have the same symptoms.

Triggers for food allergies and intolerances in cats

Cats often develop a food allergy between the ages of two and six and then suddenly react to certain food ingredients - this can also affect food that they previously tolerated without any problems. Food allergies or intolerances are triggered by proteins of plant or animal origin, i.e. protein components in the food. In rare cases, a carbohydrate source can also be the cause. Any protein in the food has the potential to trigger an allergic reaction, a subsequent cross-allergy or an intolerance.

The most common food allergens in cats include:

  • beef
  • Chicken
  • dairy products
  • eggs
  • Fish
  • Less common: soy

You should remember this

Symptoms of a food intolerance or allergy

  • vomiting or diarrhea
  • Red or inflamed skin
  • flatulence
  • Chronic ear problems
  • Frequent scratching
  • Poor growth in young cats
  • Severe hair loss
  • coughing, wheezing or sneezing
  • asthma

Difference between food allergy and intolerance

Food allergy:

Overreaction of the immune system (production of antibodies) to a specific component in food (usually a specific protein component).

Intolerance:

Hypersensitivity reaction in which the dog's own immune system is not involved (e.g. lactose intolerance)

Triggers of food allergies / intolerances

Protein components in the diet – e.g.:

  • Chicken
  • beef
  • dairy products
  • eggs
  • Fish

elimination and subsequent provocation diet

The best way to treat a food allergy or intolerance in cats is to avoid the triggering food ingredients. The triggers can be identified with an elimination diet and then a challenge diet.

  • Feeding a hypoallergenic food for 10-12 weeks
  • Do not feed treats or anything “foreign”
  • If the symptoms subside, the cause is an allergy or intolerance.
  • After 12 weeks: feed the usual food - if the same symptoms appear again after about 2 weeks, it is a food allergy or intolerance.
  • Veterinary supervision necessary – keep a food diary.

You should remember this

Dr.Clauder's for sensitive stomachs and allergy sufferers

If your cat is showing allergy symptoms or food intolerance, a long-term change in its diet is necessary. Use allergy food with hypoallergenic properties for your cat to quickly relieve symptoms and prevent them from recurring.

With careful dietary control, the prognosis for cats with food allergies is generally good.

Food emergency? The nutrition hotline helps

If you have any questions about animal nutrition, we will be happy to help you. Call us during our service hours or send us an email with your request:

  • Telephone: 0800 / 474 476 0
  • Email: hotline@dr-clauder.com

These are our service times:

  • Monday and Wednesday 3 - 9 pm
  • Tuesday and Thursday 10 a.m. - 12 p.m.
  • Friday 3 - 7 pm
  • Sunday 3 - 5 pm (every 1st Sunday of the month)

Also take a look at the FAQs: Maybe the answer to your question is there?

FAQ page nutrition hotline