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October 23, 2023

Food Allergies and Intolerances in Cats

  • Allergies
  • Ingredients
  • Protein
  • Health Issues
  • Signs + Symptoms

An adverse food reaction (AFR) is a catchall phrase that can be used to describe an inappropriate response to an ingredient found in a food, often a protein. In cats, this term encompasses both intolerances and allergies.

Food allergies are different from food intolerances. Intolerances typically manifest as digestive upset which occurs in reaction to a food component that does not agree with the animal (e.g. lactose intolerance) and does not invoke an immune response; allergies induce an inappropriate immune system response to an ingredient in which the body treats it as unsafe foreign material.

Food sensitivities can arise from various types of ingredients, whereas food allergies typically occur in response to proteins. If left untreated, a food intolerance in cats may progress to a food allergy and potentially to the development of irritable bowel disease.

In cats, food intolerance and allergies can show up at any age, and although many cases appear early in life, some may take years to develop. Many cats with diagnosed food allergies also have concurrent inhalant or contact allergies (e.g. flea bite allergies).


The symptoms of adverse food reactions are often similar to those of environmental allergies. It is important to consult with a veterinarian for the best next steps if these symptoms are identified.

Symptoms of Adverse Food Reactions

  • Itchy skin
  • Chronic or recurrent ear infections
  • Hair loss
  • Excessive scratching
  • Hot spots
  • Re-occurring skin infections
  • Vomiting
  • Diarrhea


Once environmental allergies have been ruled out, diagnosing an adverse food reaction can still be challenging. Blood and skin-patch testing are available for a number of ingredients found in pet food, however, these tests are for food allergies, not intolerances. Although the testing may show which ingredients do not produce a reaction, allergy testing can provide false positives or incorrect results.

The “gold standard” to diagnose an adverse food reaction is a food elimination-challenge trial. This trial, in part, consists of feeding a novel protein source, one that the cat has not eaten before, for at least 6-8 weeks.
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Go! Solutions Nutrition Team

Go! Solutions Sensitivities Limited Ingredient Duck Recipe is an example of a single animal protein, grain-free cat food that may be an option for a food elimination trial as it includes all the nutrients that cats require with as few ingredients as possible.

Regardless of the diet used, it must be the only thing the cat eats for the 6-8 weeks. This means no treats; absolutely nothing but special food and water. When the 6-8 weeks are up, the ingredient that was thought to create a reaction would be re-introduced as a "challenge." If there is then an adverse reaction, an adverse food reaction diagnosis would be confirmed.

For many people, the “challenge” part of an elimination food trial is not completed because once they find a food that works, there is a tendency to stick to that food and no desire to provoke a potential reaction. However, without this challenge, a diagnosis of an adverse food reaction cannot be as definitive.

Finding out whether your cat is experiencing an adverse food reaction can be tricky, but taking the time and putting in the effort to find out can certainly help your cat lead a healthier and more comfortable life.

GO! SOLUTIONS SENSITIVITIES Limited Ingredient Grain-Free Duck Recipe for Cats

Recommended Solution

Limited ingredient recipes for your feline friend

Our Go! Solutions Sensitivities recipes are specially formulated by experts to help cats suffering from food sensitivities.


Natalie Asaro

Natalie Asaro

Nutrition Manager

Natalie received both her BSc in Honours Biological Science and MSc in Companion Animal Nutrition from the University of Guelph.

Theresa Lantz

Theresa Lantz

Companion Animal Nutritionist

Theresa received both her BSc in Companion Animal Health and MSc in Animal Science from the University of Alberta.