There are a number of treatments that can be applied to a dog that suffers from allergens or Atopic Dermatitis.
Immunotherapy is the preferred treatment, and this is where the dog is injected with gradually increasing amounts of the allergen that was identified as the cause of the reaction. It can take up to ten months but is usually quite successful in up to 80% of cases.
Improving the skin quality is also another form of treatment and involves feeding a high quality food with good levels of essential fatty acids, regular bathing using moisturising shampoos and soothing lotions, and the application of ice packs.
Anti-Inflammatory treatments such as such as the use of antihistamines or herbal therapies can also be considered, but are not as effective.
Steroids are quite effective but can have major side effects for long periods, and should only be considered if other treatments are not sufficient. Identifying the type of allergy is not an exact science, but once identified, can usually be treated effectively.