An allergy is an exaggerated immune response to substances that are generally not considered harmful. When a dog's immune system identifies a normally harmless substance as a threat, it triggers an allergic reaction that can affect the skin, ears, paws, and other areas of the body. Atopic dermatitis — itchy skin caused by an allergic response to inhaled environmental allergens — is one of the most common forms of allergic disease in dogs.
Symptoms of Allergies in Dogs
If your dog begins showing any of the following signs, consult your veterinarian to determine whether an allergy may be the cause. Common symptoms include excessive licking (especially of the paws), itching and scratching at affected areas of skin, chewing on irritated skin, hair loss or red irritated skin, recurrent ear and skin infections, swelling of the face or ears, sneezing, watery eyes, hives, swelling of the mouth, throat, or eyes, and scooting the rear end on the floor.
The most commonly affected areas of skin are the face, ears, paws, base of the tail, and abdomen. Symptoms can vary depending on the type and cause of the allergy.
Causes of Allergies in Dogs
The three most common causes of allergies in dogs are flea bites, food, and environmental inhalants. Allergy symptoms develop when the immune system begins to recognize certain substances (allergens) as threats. Dogs can be allergic to a wide range of substances, including environmental factors, household items, and food ingredients.
Flea Allergy Dermatitis
Flea allergy dermatitis is an allergic reaction to flea bites. Affected dogs become itchy, usually at the base of the tail. The skin may become red, inflamed, and scabbed. Flea dirt or fleas themselves may also be visible.
Food Allergies
Food allergies and sensitivities can cause itchy skin and may be accompanied by gastrointestinal symptoms. The ears and paws are the most common areas where dogs with food allergies experience itching.
Environmental Allergies
Environmental allergies include allergens such as dust, pollen, and mold, and can be divided into indoor and outdoor categories. These allergens cause atopic allergic reactions or atopic dermatitis. Environmental allergies are typically seasonal, meaning your dog may only display symptoms during certain times of the year. The most commonly affected areas are the paws, ears, underarms, eyes, between the toes, and abdomen.
Diagnosing Allergies in Dogs
Determining the specific substance a dog is allergic to can be a complicated process. Your veterinarian will first want to confirm that symptoms are not caused by other health conditions.
After ruling out other possibilities, your veterinarian may suggest allergy testing to identify the allergen triggering the reaction. Food allergies are typically diagnosed using an elimination diet method. Flea allergy dermatitis is usually easier to diagnose, as it is often identified by finding fleas on the dog's body and observing improvement after applying a flea prevention product.
Treatment of Dog Allergies
The most effective way to treat an allergy is to avoid or remove the allergen, though this is not always possible. Treatment methods vary depending on the type of allergy.
Medications
Your veterinarian may recommend either prescription or over-the-counter medications. Over-the-counter options may include supplements and antihistamines. Prescription medications may include immunosuppressants, anti-inflammatories (including steroids), and antibiotics for secondary infections caused by skin damage. Topical treatments such as medicated shampoos or sprays can also help manage affected areas of skin.
Allergy Supplements
Nutritional supplements designed to support skin health can complement your dog's allergy treatment plan. DermaBliss Advanced Seasonal Allergy Health Chews provide targeted support for dogs dealing with seasonal and environmental allergy symptoms. For dogs experiencing recurrent ear infections related to allergies, the OticBliss ear care line offers products formulated specifically for ear health and hygiene. Explore the full DermaBliss collection for additional skin health and allergy support options.
