Understanding Dog Diarrhea And Allergies

Diarrhea and allergies can be distressing to a dog. While mild diarrhea and allergic reactions are common and  usually harmless, their frequency, and  intensity raises concern.

As a dog owner, it is natural to be concerned about your dog’s well-being when they are not feeling well.

We delve into dog diarrhea and allergies, what to do and when to seek help. By understanding the potential causes and how to respond, you can provide the best care and support for your dog.

Dog Diarrhea And Allergies

dog diarrhea and allergies

Diarrhea in dogs is the frequent passage of loose, watery stools. It can be caused by a variety of factors, such as dietary changes, infections, stress, dietary indiscretion, poisoning or underlying medical conditions.

Allergies in dogs refers to an abnormal immune response to a substance that is typically harmless to most dogs. 

These substances, called allergens, can be found in the environment, such as pollen, mold, or dust mites, or in the dog’s food, such as certain proteins or carbohydrates.

Allergies can cause a variety of symptoms in dogs, including itching, sneezing, runny eyes, and irritated skin.

Can allergies cause diarrhea in dogs?

Allergies can cause diarrhea in dogs by triggering an immune response in the gut, leading to inflammation and irritation of the intestinal lining. 

For example, when a dog with a food allergy eats the allergenic food, the immune system recognizes the protein as harmful and produces an inflammatory response in the gut, which can cause symptoms such as vomiting, diarrhea, and stomach pain. 

In the case of environmental allergies, such as allergies to pollen, mold, or dust mites, the allergen is something in the dog’s environment. 

When the dog is exposed to the allergen, the immune system produces an inflammatory response, which can cause symptoms such as itching, sneezing, and runny eyes. These symptoms include gastrointestinal symptoms such as diarrhea.

Related: Dog diarrhea and shaking: Causes and when to seek help

Is it normal for dogs to have diarrhea when experiencing allergic reactions?

Diarrhea is a common symptom of allergies in dogs, but it is not normal for dogs to have diarrhea all the time. 

Allergies can cause an inflammatory response in the gut, leading to diarrhea, vomiting and stomach upset. However, these symptoms are usually intermittent and occur when the dog is exposed to the allergen.

Some dogs may have other symptoms such as itching, sneezing, runny eyes, and irritated skin, that are associated with allergies, but not all dogs will show the same signs.

See Also: Dog diarrhea and coughing (Explained)

What do I do when my dog has diarrhea with allergies?

When your dog is experiencing diarrhea due to an allergic reaction, consult your veterinarian.

It is important to consult your veterinarian to determine the underlying cause of your dog’s allergic reaction and diarrhea. The veterinarian will develop an appropriate treatment plan that addresses both issues.

Here are  other signs that indicate that you should see a veterinarian immediately:

Severe or bloody diarrhea: If your dog’s diarrhea is prolonged or if there is blood or mucus in the stool, this could be a sign of a serious underlying condition and requires immediate veterinary attention.

Diarrhea can be caused by a variety of factors, some of which can be serious and require prompt medical attention.

Other symptoms: Other symptoms may accompany diarrhea and allergies, such as vomiting. If your dog is vomiting along with diarrhea, this can lead to dehydration and other complications that require immediate medical attention. 

Other symptoms to look out for include lethargy, lack of appetite, breathing difficulties, signs of pain or discomfort, fever, and signs of dehydration, such as a dry nose or mouth and sunken eyes.

If your dog is a puppy or an older dog: Puppies and older are generally more vulnerable than healthy adult dogs so delaying treatment could result in their condition worsening or becoming more difficult to treat. Therefore, it is essential to seek immediate medical care.

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Treatment options for dogs with diarrhea and allergies

Treatment options for dogs with diarrhea and allergies depend on the underlying cause of each condition. Here are some general treatment options that may be recommended by your veterinarian:

Diet modification

Your veterinarian may recommend a hypoallergenic diet if your dog has a food allergy.  A hypoallergenic diet that eliminates allergenic food and provides a nutritionally complete diet.


Your veterinarian may prescribe medications to help control your dog’s symptoms, such as antihistamines for itching, and corticosteroids to reduce inflammation. 

In cases of diarrhea caused by bacterial or parasitic infection, antibiotics or antiparasitic medication may be prescribed.

Key Takeaway

Dog diarrhea and allergies can be a source of discomfort and pain for your dog, as well as a source of worry and stress for you. 

It is important to understand that there are different types of allergies and diarrhea, each with its own set of causes and symptoms. 

To properly diagnose and treat your dog’s condition, consult with your veterinarian. The veterinarian can help to determine the underlying cause and recommend treatment.