Allergies in Dogs: Types, Symptoms, and Treatment
Key Takeaways
Allergies in dogs are an immune response to a foreign substance. The immune system produces antibodies that react with antigens from the allergen, triggering symptoms like itching, redness, swelling, and gastrointestinal upset.
The three main types are skin allergies (contact dermatitis, flea allergies, hot spots), food allergies (proteins like chicken, dairy, soy, wheat, and eggs), and environmental allergies (pollen, dust, mold, smoke, grasses).
At-risk breeds include Shar-Peis (atopy worsened by skin folds), Golden Retrievers (itchy skin starting at 1–3 years), Boston Terriers (food and environmental sensitivities), and Dalmatians (topical allergies from grooming products).
Common symptoms include paw chewing, rashes, watery eyes, excessive itching, wheezing, diarrhea, and facial or ear swelling.
Treatment options include quercetin supplements, daily allergy chews, hypoallergenic shampoos, antihistamines (vet-prescribed only), and allergy testing by a veterinary dermatologist.
Severe reactions — including facial swelling, difficulty breathing, or bleeding from excessive scratching — should be treated as an emergency.
Table of Contents
What Are Seasonal Allergies in Dogs?
Which Dog Breeds Are Most at Risk for Allergy Issues?
Signs and Symptoms of Allergies in Dogs
Common Allergy Treatments and Relief
At-Home Tips for Dog Allergy Prevention and Healthy Skin
Dogs, just like people, can struggle with a variety of allergies. Every dog's reaction to allergens can be unique, and predispositions to certain allergic reactions can vary by breed, making it difficult to pinpoint the root cause of symptoms.
Recognizing the early signs of an allergic reaction is important for every dog owner. Understanding how a dog's immune system reacts to an allergen can help you support your dog during a reaction, respond appropriately to the allergen in question, and determine which treatment options will help.
Allergies in dogs are defined as an immune response to a foreign substance. These substances could be innately harmless but may cause hypersensitivity in certain animals, triggering a defensive immune reaction.
The immune system produces antibodies (blood proteins) that react with antigens presented by the incoming allergen. Antibodies create a chemical reaction with antigens (toxins or foreign substances) in order to counteract their effects. During this process, symptoms of an allergic reaction will occur.
Identifying the exact cause of your dog's allergy symptoms can be challenging, and there are many types of dog allergies to consider. Skin allergies, food allergies, and environmental allergies are the three main categories of allergens in dogs.
Dog skin allergies are often caused by topical (skin) contact with an allergen, but can also develop in response to allergens that have been ingested. Dermatitis (skin inflammation in response to an irritant) is the most common sign of skin allergies and can alert owners that something is triggering an immune response. Flea allergies or an infected hot spot can also cause symptoms of an allergic skin reaction.
Canine pododermatitis is a condition that affects the skin around the paw pads, causing inflammation and swelling. One of the most common causes of a swollen paw is allergies, making DermaBliss Face & Skin Wipes and regular allergy treatments important for dogs with sensitive skin.
Protein allergies are the most common food allergies in dogs, including reactions to wheat, dairy, soy, chicken, and chicken eggs. Food allergies are unique in that they do not trigger an immediate immune response. Instead, symptoms will gradually worsen as long as the dog continues to ingest the triggering food.
If your dog has seasonal allergies, it is most likely due to an environmental allergen. This category includes irritants like pollen, smoke, dust, mold, certain grasses, and even pet dander from other animals. These types of allergies can be especially troublesome for dogs that spend a lot of time outdoors.
Pollen allergies do not affect only outdoor dogs — keeping windows shut or using an air purifier during high-pollen days can help reduce allergy symptoms while indoors.
Dogs with sensitive skin may be at higher risk for allergy symptoms. Chronic conditions like eczema and psoriasis are linked to a compromised immune system, meaning dogs with these disorders can be more vulnerable or sensitive to irritation from foreign substances. Extremely dry or damaged skin is also less capable of protecting nerve endings, making dogs with severely dry skin more susceptible to irritation and discomfort.
Several breeds are particularly prone to skin disorders or skin allergies and may need additional support in protecting their skin.
Shar-Pei. Chinese Shar-Peis can be more prone to skin allergies and dermatitis than other breeds due to a condition known as atopy. Atopy is a genetic predisposition to allergic reactions — most commonly eczema (atopic dermatitis), allergic rhinitis, and asthma. In the case of Shar-Peis, the excessive folds of skin may worsen symptoms of atopy, especially when affected by eczema.
Golden Retriever. Golden Retrievers are another breed commonly affected by atopy. They may struggle more with itchy skin, especially around the ears, belly, paws, and folds of skin. Atopy symptoms in Golden Retrievers can start in adolescence (1–3 years) and usually intensify with age.
Boston Terrier. As a breed, Boston Terriers are suspected to have hypersensitivity to both food and environmental allergies. Owners may find that their Boston Terriers are more sensitive to soy and wheat gluten, and may struggle with environmental allergens like dust, dander, mold, and synthetic fragrances.
Dalmatian. Dalmatians — with their distinctive short-hair coats — may be more prone to topical allergies. Switching shampoo or soap can be a trigger for this type of allergy, as can the detergent used when washing towels or bedding.
When assessing allergies in dogs, symptoms can present in a variety of ways.
A dog chewing their paws may be suffering from itchy atopic dermatitis, which can appear as redness, swelling, hair loss, and scaling around the top and bottom of the paw.
If you notice signs of skin inflammation or irritation like flaking, oozing, hair loss, redness, or swelling, your dog may be suffering from an uncomfortable skin rash. Rashes are a common presentation of allergies in dogs.
Conjunctivitis is inflammation affecting the lining of the eye and can occur as a result of allergies. Signs of conjunctivitis include watery eyes or a yellow-green discharge from the eye.
Dogs itching their ears, biting their skin, or scratching excessively may be dealing with an immune response to an allergen.
Dogs suffering from environmental or seasonal allergies may wheeze or cough in order to expel the irritant, or as a result of post-nasal drip. Brachycephalic breeds with flat faces and short snouts (such as Pugs and Bulldogs) have more compact airways that can make wheezing worse.
An upset stomach can present as diarrhea, soft stool, vomiting, or bloating. These are often symptoms of a food allergy.
Swelling is a symptom of inflammation, which may be part of the immune response to an allergen. Swelling can occur as hives, facial swelling, or swelling of localized areas like the earflaps, eyelids, or lips.
Treatment options for dog allergies are varied. Here are several approaches for managing allergy symptoms.
Quercetin is a naturally sourced flavonoid that can help with symptoms of allergies such as swelling, itching, and watery eyes through its ability to block histamines. Quercetin can be given to your dog during peak allergy seasons when symptoms tend to be at their worst. DermaBliss Allergy & Immune Soft Chews contain Quercetin along with other allergy-friendly ingredients for convenient daily support.
Giving allergy supplements to dogs may help support their natural immune response to certain allergens. DermaBliss Advanced Seasonal Allergy Health Chews support nose-to-tail health — including GI function, skin health, and immune balance — and can be beneficial for dogs experiencing regular allergy symptoms. Some supplements can be given daily, while others can be used exclusively for seasonal allergies. Using a daily allergy supplement may even reduce your dog's need for veterinarian-prescribed allergy treatment.
"I use the DermaBliss line as part of multimodal therapy for my patients to reduce inflammation and restore the barrier function of the skin and to aid in treatment of secondary infections. The comprehensive product line works to support the skin not only on the outside but from the inside out."
— Dr. Joya Griffin, DVM, DACVD, Animal Dermatology Clinic
Carefully choosing topical products — like shampoo and soap — without irritating ingredients is crucial for protecting dogs with atopy and sensitive skin. A pH-balanced, anti-itch allergy shampoo made with gentle, hypoallergenic ingredients or numbing agents like Pramoxine Hydrochloride (for itch relief) is a good place to start.
Working with an allergist may yield answers for owners finding it difficult to pinpoint the source of their dog's allergy symptoms. Veterinary offices can perform allergy testing, where they analyze skin tests and blood tests to determine the source of allergies.
Perhaps the most commonly used treatment for allergies in dogs is a class of drugs called antihistamines. Similar to Quercetin, antihistamines block histamines in order to reduce or eliminate itching, redness, and swelling caused by an immune response to an allergen. Antihistamines can be prescribed by your veterinarian, especially if your dog needs a more targeted allergy treatment.
It is natural to wonder if household allergy treatments might work for your dog. Can I give my dog Benadryl for allergies? Zyrtec? Claritin? Human antihistamines should never be given to dogs without veterinary guidance. While antihistamines as a drug class can be used in dogs, the dosages, formulations, and active ingredients in human products may not be safe or appropriate. Some human medications contain additional ingredients like decongestants or xylitol that are toxic to dogs. Always consult your veterinarian before giving any medication.
In addition to veterinarian-recommended treatments like antihistamines and prescription medications, treating your dog's allergies at home can help manage daily symptoms.
Giving your dog daily chews or powder supplements may help keep daily allergy symptoms at bay while supporting healthy immune function. Browse the full DermaBliss allergy and skin care collection for chews, wipes, shampoos, and sprays.
Allergens from certain grasses, pollen, dust, mites, and dander can cause allergy symptoms in your dog's ears. Wiping down your dog's ears once a day can help prevent debris from causing further irritation. OticBliss Ear Wipes provide gentle daily cleaning for allergy-prone ears.
Atopic dermatitis (eczema) can be uncomfortable, and certain shampoo products can further irritate sensitive skin. Using a soap-free shampoo will help maintain skin hydration without stripping protective oils. DermaBliss Anti-Itch Shampoo is formulated for dogs with allergy-related skin sensitivity.
Allergies can be a potential cause of ear infections and other ear conditions. Rinsing the ear can help ensure allergens are not spending too much time in your dog's ear canal. OticBliss Antibacterial & Antifungal Ear Flush removes debris while delivering antimicrobial ingredients.
Dogs with skin irritation from allergies may need targeted relief. Medicated allergy sprays and hot spot sprays can help soothe irritation on specific areas of the body.
Regular antihistamine dosages will depend on the type and severity of your dog's allergy symptoms, and at-home treatments are a good way to stay on top of chronic allergies. Discuss symptoms with your veterinarian to find the best combination of treatments.
When do dog allergies become an emergency? Dogs with recurring allergies — whether seasonal or situational — could be affected by atopy and should be seen by a veterinarian to establish a treatment plan suited to chronic symptoms.
Dogs with severe itching that causes bleeding or open wounds should see a vet immediately to avoid further injury. Anything that affects your dog's ability to breathe, see, or function normally should also be treated as an emergency. This includes swelling of the face, tongue, eyes, or nostrils, which are all signs of a severe allergic reaction.
If your dog has a severe allergic reaction, secure them in a kennel or safe position inside your vehicle with adequate ventilation, head to your nearest emergency animal hospital or vet clinic, and if someone else is in the car, have them call ahead to the clinic for advice on keeping your dog comfortable until you arrive.
While severe allergic reactions are not always common, they can happen to any dog. Keep a record of your dog's preexisting conditions, sensitivities, and allergies to consult when shopping for topical products, food, supplements, and other products. This may help you avoid potential allergic reactions in the future and better support your dog's health.
The three main types are skin allergies (caused by topical contact with an irritant, flea bites, or hot spots), food allergies (most commonly triggered by proteins such as chicken, dairy, soy, wheat, and eggs), and environmental allergies (caused by pollen, dust, mold, smoke, certain grasses, and pet dander from other animals). Each type triggers an immune response that produces symptoms like itching, redness, swelling, or gastrointestinal upset.
Common symptoms include paw chewing and redness (atopic dermatitis), skin rashes with flaking or oozing, watery eyes or yellow-green discharge (conjunctivitis), excessive itching and scratching, wheezing or coughing, diarrhea and gastrointestinal upset, and swelling of the face, ears, eyelids, or lips. Symptoms can vary depending on the type of allergen and the individual dog's sensitivity.
Breeds with sensitive skin or genetic predispositions to atopy are most at risk. Chinese Shar-Peis are prone to atopic dermatitis worsened by their deep skin folds. Golden Retrievers commonly develop itchy skin around the ears, belly, and paws starting as early as 1–3 years of age. Boston Terriers may have hypersensitivity to food allergens like soy and wheat gluten as well as environmental triggers. Dalmatians with their short-hair coats can be prone to topical allergies from shampoos, soaps, and detergents.
Human antihistamines should never be given to dogs without veterinary guidance. While antihistamines as a drug class can be used in dogs, the dosages, formulations, and active ingredients in human products may not be safe or appropriate. Some human medications contain additional ingredients like decongestants or xylitol that are toxic to dogs. Always consult your veterinarian before giving any medication to your dog.
Veterinary offices can perform allergy testing including skin tests and blood tests to determine the source of allergies. Working with a veterinary allergist or dermatologist may be helpful for dogs with persistent or complex allergy symptoms. Elimination diets supervised by a veterinarian can help identify food allergies by systematically removing and reintroducing potential triggers.
Contact your veterinarian if your dog has severe itching that causes bleeding or open wounds, swelling of the face, tongue, eyes, or nostrils, difficulty breathing, recurring allergy symptoms that do not respond to at-home treatments, or any symptom that affects their ability to see, breathe, or function normally. Severe allergic reactions should be treated as an emergency.
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