Allergy dermatitis, also known as atopic dermatitis is when common, otherwise harmless substances or foods cause an overreactive response in the pet. This can cause redness, irritation, itching, and bacterial overgrowth if left untreated. There are some tests that can be done to get to the root cause of the allergy if inhalant allergy is suspected. If the route of allergy testing is taken there are allergen specific immunotherapy that can be done to lessen the sensitivity the pet has to the allergens. This is done over a length of time and may be needed life-long. There is also the option of anti-allergy drugs such as antihistamines, steroids, cyclosporin, and oclacitinib. However some of these medications can cause side effects when used long-term. A medication free way to help with allergies is to avoid exposure to allergen triggers. Unfortunately this can be difficult to near impossible for many pets depending on what causes their allergen response. Another option, if food allergy is suspected over inhalant allergy, is a prescription hypoallergenic food trial. It is important to use a prescription hypoallergenic diet for food trials, not over the counter, because thprescription diets have been specially formulated for allergy pets and contain only the protein listed on the bag.