What Is Atopic Dermatitis in Dogs?
Atopic dermatitis is a chronic, pruritic (intensely itchy) inflammatory skin disease with a strong genetic component. It develops when a dog's immune system overreacts to environmental allergens such as house dust mites, grass and tree pollens, moulds, and storage mites. Rather than tolerating these substances harmlessly, the dog's skin and immune defences mount an exaggerated response that drives relentless scratching, licking, and chewing.
The condition is lifelong. While it can be managed very effectively with modern treatments, owners need to understand that there is no straightforward cure. Recognising the signs early and working with a veterinary dermatologist gives dogs the best chance of a comfortable life.
Breeds Most Commonly Affected
Atopic dermatitis has a clear hereditary basis, which means certain breeds carry a significantly higher risk. The breeds most frequently diagnosed in the UK and Europe include:
- West Highland White Terrier
- Golden Retriever
- Labrador Retriever
- German Shepherd
- English Bulldog
- Boxer
- Dalmatian
- Shar Pei
- Beagle
If you own one of these breeds and notice persistent scratching beginning between six months and three years of age, atopic dermatitis should be high on the list of possibilities to discuss with your vet.
Recognising the Symptoms
The hallmark sign is pruritus — itching that is often seasonal at first but may become year-round as the disease progresses. Dogs typically scratch and rub at the face, ears, paws, armpits, groin, and belly. Common signs include:
- Repeated licking or chewing of the paws, leaving them rust-stained from saliva
- Rubbing the face along carpets or furniture
- Recurrent ear infections (otitis externa)
- Redness and greasiness of the skin in affected areas
- Hair loss from self-trauma
- Thickened, darkened skin (lichenification) in chronic cases
How Vets Diagnose Atopic Dermatitis
There is no single definitive test for atopic dermatitis. Veterinary dermatologists follow the internationally recognised ICADA/WSAVA 2015 diagnostic criteria, which use a scoring system based on clinical signs and breed history to support the diagnosis. Crucially, diagnosis is made by exclusion — other conditions that cause very similar itching must be ruled out first.
Before reaching an atopic dermatitis diagnosis, your vet will need to eliminate:
- Flea allergy dermatitis — the most common skin allergy in the UK
- Food allergy — identified through a strict elimination diet trial of at least eight weeks
- Sarcoptic mange (scabies) — a highly contagious mite infestation causing intense itch
- Other ectoparasites and skin infections
Once these have been excluded and the clinical picture fits, intradermal skin testing or allergen-specific serology can identify the precise environmental triggers — information that is essential if immunotherapy is being considered.
Secondary Infections
The damaged, inflamed skin of an atopic dog is highly susceptible to secondary infections. The two most common organisms involved are the bacterium Staphylococcus pseudintermedius and the yeast Malassezia pachydermatis. These infections dramatically worsen the itch and must be treated alongside the underlying allergy. Your vet may prescribe antibiotics, antifungal tablets, or medicated shampoos containing chlorhexidine or miconazole, depending on which organisms are present.
Modern Treatment Options
Treatment is tailored to each dog and often involves a combination of approaches. The main options available in the UK are:
Apoquel (Oclacitinib)
Apoquel is a JAK inhibitor — a targeted drug that blocks specific signalling pathways in the immune system responsible for triggering itch and inflammation. It works rapidly, with many dogs showing significant relief within 24 hours of the first dose. It is given as a daily tablet and is suitable for long-term use in dogs over 12 months of age.
Cytopoint (Lokivetmab)
Cytopoint is a monthly injection of a monoclonal antibody that specifically targets interleukin-31 (IL-31), the key cytokine responsible for triggering the sensation of itch in atopic dogs. Because it mimics a naturally occurring protein, it has a very favourable safety profile. Most dogs experience relief within one to two days of the injection, with effects lasting four to eight weeks.
Atopica (Ciclosporin)
Ciclosporin is an immunosuppressant that damps down the allergic response at a cellular level. It takes four to eight weeks to reach full effect, so it is not suitable for immediate relief. However, once a dog responds, the dose can often be reduced to every other day, making it a cost-effective long-term option. It is given as a once-daily capsule and is generally well tolerated, though some dogs experience mild gastrointestinal side effects initially.
Allergen-Specific Immunotherapy (ASIT)
Immunotherapy is the only disease-modifying treatment available for atopic dermatitis — meaning it aims to alter the underlying immune dysfunction rather than just controlling symptoms. Based on the results of intradermal skin testing or allergen serology, a customised vaccine is prepared containing small, gradually increasing doses of the specific allergens to which the dog reacts. This is administered by injection or as oral drops over a period of one to three years.
Immunotherapy requires patience and commitment. Approximately 50 to 70 per cent of dogs achieve meaningful improvement, and some may eventually require less concurrent medication. It is the treatment most likely to provide lasting benefit.
Corticosteroids
Short courses of prednisolone or other corticosteroids can provide rapid relief during flare-ups. Long-term use is generally avoided due to the risk of side effects including increased thirst, weight gain, and suppression of the adrenal glands.
Skin Barrier and Environmental Management
Supporting the skin barrier is an important part of long-term management. Dogs with atopic dermatitis have a defective skin barrier that allows allergens to penetrate more easily. Ceramide-based shampoos and conditioners help restore barrier function, while omega-3 essential fatty acid supplementation (such as fish oil) has anti-inflammatory properties and improves coat and skin quality.
Reducing allergen exposure at home can lessen the severity of flare-ups. Practical measures include:
- Using HEPA air filters to reduce airborne dust mite particles
- Washing the dog's bedding weekly at 60 degrees Celsius
- Avoiding walks during high pollen periods and wiping the dog down after outdoor time
- Using dust mite-proof mattress covers in rooms where the dog sleeps
Atopic dermatitis is a condition that demands consistent management, but with the right combination of treatments, most affected dogs can enjoy an excellent quality of life. Early diagnosis and referral to a veterinary dermatologist will give your dog the widest range of treatment options.