If your dog or cat is always scratching, getting ear infections over and over, or having ongoing stomach issues, it’s easy to start wondering if their food might be playing a role. Food allergies are something veterinary dermatologists discuss with pet owners frequently, but there are also many misconceptions about how common they are and how they’re diagnosed.

Let’s take a closer look at a few of the most common myths surrounding food allergies in pets.

What is a food allergy in pets?

A food allergy happens when a pet’s immune system overreacts to something they’re eating. In most cases, the reaction is triggered by a protein source in the food rather than carbohydrates.

Pets with food allergies often develop skin-related symptoms. These may include persistent itching, recurrent ear infections, unpleasant skin odor, or frequent skin infections. Some pets may also experience digestive issues, such as vomiting or diarrhea, that don’t seem to resolve.

Because these symptoms can look similar to other skin conditions, diagnosing a food allergy requires careful evaluation.

Myth #1: Food allergies are the most common allergy in dogs and cats

Food allergies certainly occur, but they are not the leading cause of allergic skin disease in pets.

Environmental allergies, such as reactions to pollen, dust mites, or mold, are seen far more often. Flea allergies are also a very common reason for itching. Food-related allergies represent a smaller portion of allergy cases in dogs.

Since the symptoms of these different conditions can look similar, it’s easy to assume food is the problem when something else may be responsible.

Myth #2: Allergy testing can diagnose food allergies

Many tests marketed to pet owners claim they can identify food allergies using blood, saliva, or even hair samples. Unfortunately, these tests have not been shown to diagnose food allergies in pets reliably.

Studies evaluating these tests have demonstrated inconsistent and inaccurate results. Because of this, our board-certified veterinary dermatologists do not rely on them to determine whether a pet has a food allergy.

Myth #3: Grains are usually the problem

Grain-free diets have gained a lot of attention in recent years, but grains are not typically the culprits behind food allergies in dogs and cats. Most pets with food allergies react to dietary proteins. Ingredients such as beef, chicken, dairy products, eggs, and soy are more commonly associated with allergic reactions than grains.

Myth #4: Chicken is the main cause of food allergies

Chicken often gets singled out as a common trigger, but the situation is more nuanced. While some pets may develop an allergy to chicken, many dogs and cats tolerate it perfectly well.

Each pet’s immune system is different, which is why identifying the specific ingredient involved requires a systematic approach.

Myth #5: Switching pet food will solve the issue

Some pets may improve when their diet changes, particularly if the new food removes the ingredient causing the reaction. However, many commercial diets contain multiple protein sources or trace ingredients, making it difficult to pinpoint the true trigger. For pets with suspected food allergies, board-certified dermatologists often recommend specialized diets designed specifically for allergy evaluation.

How veterinarians diagnose food allergies

The most dependable way to determine whether a pet has a food allergy is through an elimination diet trial.

During this process, pets eat a carefully selected diet, often a prescription hypoallergenic diet, for several weeks. Throughout the trial, pets must avoid all other foods, including treats and flavored medications.

If the symptoms improve during the trial and return when the original diet is reintroduced, it suggests that a dietary ingredient is responsible.

When to talk to your veterinarian

If your pet is experiencing ongoing itching, skin infections, ear infections, or unexplained digestive problems, it’s worth discussing these symptoms with your primary veterinarian.

Food allergies are only one possible cause of these issues, and a veterinarian or a board-certified veterinary dermatologist can help determine what may be contributing to your pet’s discomfort and recommend the best next steps.

Learn more about GCVS Houston’s Dermatology department HERE.

Written By:

Katrine Voie, DVM, MS, DACVD