# Symptoms of Food Allergies in Dogs and Cats

- Published: 2025-08-06
- Updated: 2025-08-29
- URL: https://bellywelly.eu/en-US/a/symptoms-of-food-allergies-in-dogs-and-cats-i13

What is a food allergy? A food allergy is an excessive immune system reaction to food components, most often proteins that resist digestion and enter the body in unchanged form. In dogs and cats, the most common allergens are animal-derived proteins such as beef, chicken, fish, eggs, as well as milk and dairy products. Many commercial pet foods contain these ingredients, increasing the risk of allergies. Grains (wheat, corn, soy), preservatives, and additives can also be allergens.

7 August 2025

## Symptoms of Food Allergies in Dogs and Cats

   
![](https://bellywelly.eu/files/BW-ARTICLE-IMG/web/Obajwy%20alergii.jpg)

#### What is a food allergy? A food allergy is an excessive immune system reaction to food components, most often proteins that resist digestion and enter the body in unchanged form.

#### It’s important to distinguish allergies from food intolerances, which are not immune-related and may present similar symptoms but usually occur after consuming larger amounts of a given food and are not necessarily chronic.

#### In dogs and cats, the most common allergens are animal-derived proteins such as beef, chicken, fish, eggs, as well as milk and dairy products. Many commercial pet foods contain these ingredients, increasing the risk of allergies. Grains (wheat, corn, soy), preservatives, and additives in pet food can also be potential allergens.

#### Food allergies in dogs and cats can manifest through a variety of symptoms, both dermatological and gastrointestinal.

#### Skin Symptoms:

-   #### Itching: Often intense scratching, licking, and biting of the skin, especially around the ears, paws, and face
    
-   #### Redness and irritation: May include rashes, pimples, and dandruff
    
-   #### Hair loss: Due to excessive scratching and licking, fur may fall out in specific areas
    
-   #### Skin infections: Prolonged scratching can lead to secondary bacterial or fungal infections
    
-   #### Ear problems: Ear inflammation, itching, redness, and unpleasant odor may indicate a food allergy
    

#### Digestive Symptoms:

-   #### Vomiting and diarrhea: May be chronic and recurring
    
-   #### Bloating and gas: Increased gas and bloating are common signs of food allergies
    
-   #### Loss of appetite and weight: Allergies may cause reduced appetite and weight loss
    

#### Other Symptoms:

-   #### Unusual behavior: Pets may show anxiety, irritability, chewing and licking various objects
    
-   #### Respiratory issues: Less common, but coughing, sneezing, and shortness of breath may occur
    

#### Food allergies can affect the body’s ability to absorb nutrients from food.

#### Diagnosing food allergies involves eliminating potential allergens from the diet and observing the pet’s reaction. This requires consultation with a veterinarian and may include allergy testing.

#### Because food allergy symptoms can resemble other conditions, it’s important to consult a veterinarian for proper diagnosis and treatment.