Pet Allergy Management Guide: Identifying and Managing Pet Allergies

What Are the Types of Pet Allergies Explained?

The three main allergy types in dogs and cats are food allergies, environmental allergies (atopic dermatitis or atopy), and flea allergy dermatitis (FAD). Food allergies are caused by an immune reaction to specific proteins in the diet, most commonly beef, chicken, dairy, wheat, and soy. They cause year-round symptoms regardless of season and can develop at any age, even to foods the pet has eaten for years without issue.

Environmental allergies (atopy) are triggered by airborne allergens including pollen, dust mites, mould spores, and grass. They often follow seasonal patterns in the UK, worsening in spring and summer when pollen counts are high, though dust mite allergies cause year-round symptoms. Atopy is particularly common in breeds like Labrador Retrievers, Golden Retrievers, West Highland White Terriers, Bulldogs, and Staffordshire Bull Terriers.

Flea allergy dermatitis is the most common allergy in UK pets. It is caused by a hypersensitivity to proteins in flea saliva. Affected pets react severely to even one or two flea bites, developing intense itching, hair loss, and skin lesions, typically concentrated around the base of the tail, lower back, and inner thighs. Strict year-round flea prevention is essential for management. See our seasonal care calendar for flea prevention scheduling.

How Should You Recognise Allergy Symptoms in Dogs and Cats?

The primary symptom of allergies in pets is itchy skin (pruritus). In dogs, this manifests as scratching, licking (especially paws), face rubbing, ear scratching, and scooting. Hot spots (acute moist dermatitis) and recurrent ear infections are common secondary problems. In cats, symptoms include over-grooming leading to bald patches, miliary dermatitis (small scabby bumps), chin acne, and eosinophilic granuloma complex (raised, ulcerated skin lesions).

Food allergies may also cause gastrointestinal symptoms including vomiting, diarrhoea, flatulence, and frequent bowel movements. However, many pets with food allergies show only skin symptoms. Environmental allergies rarely cause digestive symptoms but often cause watery eyes, sneezing, and runny nose alongside skin itchiness.

The location of itching can suggest the allergy type. Paw licking and ear infections are more associated with environmental allergies. Itching around the rear and base of the tail suggests flea allergy. Facial itching and generalised body itching can indicate food allergy. However, overlap is common, and many pets have multiple concurrent allergies.

How Should You Diagnose Pet Allergies: Tests and Elimination Diets?

Diagnosing the specific allergy type requires systematic investigation. Your vet will start with a thorough history and examination, checking for flea evidence, assessing the pattern and seasonality of symptoms, and reviewing the diet. Flea allergy is diagnosed by response to strict flea control. If symptoms persist despite complete flea elimination, food allergy or atopy is investigated.

Food allergy diagnosis requires an elimination diet trial lasting 8-12 weeks. Your pet eats a novel protein diet (a protein they have never eaten before, such as venison, duck, or hydrolysed protein) with absolutely no other food, treats, or flavoured medications. If symptoms improve, the original diet is reintroduced to confirm the reaction. This process is time-consuming but is the only reliable way to diagnose food allergies; blood tests for food allergies are unreliable in pets.

Environmental allergies can be confirmed through intradermal skin testing (considered the gold standard) or blood tests for allergen-specific IgE. These tests identify which environmental allergens trigger reactions, enabling targeted immunotherapy (allergy desensitisation injections). Your vet may refer you to a veterinary dermatologist for these specialised tests.

What Are the Treatment Options Available in the UK?

Allergy treatment in the UK combines allergen avoidance, symptomatic relief, and long-term management. For food allergies, the treatment is permanent avoidance of the identified allergen through a carefully selected diet. For environmental allergies, complete avoidance is rarely possible, so treatment focuses on reducing exposure and managing symptoms.

Medical treatments include antihistamines (often first-line, though effectiveness varies between pets), corticosteroids (effective but with long-term side effects), ciclosporin (Atopica), and newer targeted therapies. Oclacitinib (Apoquel) is a Janus kinase inhibitor specifically licensed for dogs that provides rapid itch relief with fewer side effects than steroids. Lokivetmab (Cytopoint) is a monthly injection that targets the itch signal directly and is well tolerated by most dogs.

Allergen-specific immunotherapy (desensitisation) is the only treatment that addresses the underlying immune response rather than just symptoms. Based on skin test or blood test results, a customised vaccine is prepared containing your pet’s specific allergens. Administered as regular injections over months to years, it gradually reduces the immune response. Success rates are approximately 60-70 percent in dogs. For multi-pet considerations, see our multi-pet household guide.

What Is the Supportive Care and Home Management?

Alongside medical treatment, supportive home care significantly improves allergic pets’ comfort. Regular bathing with a hypoallergenic or medicated shampoo removes allergens from the coat and soothes irritated skin. For dogs, bathing every 1-2 weeks during flare-ups is beneficial. For cats, bathing is usually impractical, but wiping the coat with a damp cloth after outdoor access helps remove pollen.

Essential fatty acid supplementation (omega-3 and omega-6) improves skin barrier function and may reduce the severity of allergic reactions. Fish oil supplements designed for pets are widely available in the UK and can be added to food daily. Some veterinary diets for allergic pets include elevated fatty acid levels.

Environmental management for dust mite allergies includes washing pet bedding weekly at 60 degrees Celsius, using anti-allergy bed covers, vacuuming frequently with a HEPA filter vacuum, and reducing carpet and soft furnishing exposure. For pollen allergies, wiping paws and belly after walks during high pollen seasons, avoiding walks during peak pollen hours (morning and evening), and keeping windows closed during high pollen counts all help reduce allergen exposure.