The most common dog allergies are inhalant (atopy), such as dust mites, pollen, and molds. Reduce exposure to dust and pollen by frequent cleaning and use of air cleaners. Close the windows and run the air conditioner. A dehumidifier will reduce mold. Eliminate mold from the soils in houseplant pots by covering with a layer of activated charcoal.}
Treat symptoms with frequent baths using a medicated shampoo. Use topical sprays or creams for localized itching. Antihistamines can be very helpful. Not all are safe for dogs so consult with your vet before medicating your pet. You may have to try a few different antihistamines to find one that doesn't keep your pet too drowsy. Corticosteroids are for temporary use providing quick relief from severe symptoms. Long-term use is problematic because this medication suppresses the immune system. Omega-3 is a natural anti-inflammatory that is safe and can be used with antihistamines to reduce the need for more dangerous medications like the corticosteroids.
Immunotherapy stimulates the immune system to decrease the body's reaction. Shots contain small amounts or extracts of the allergen based on results of skin testing. The dog's owner gives shots to the pet at home. They are very effective but slow to work, taking 6-12 months to see improvement.
When dogs bite and scratch creating open sores, infection can enter the bloodstream, requiring antibiotics. The sooner dog allergies treatment begins, the less prescription medications like antibiotics and corticosteroids will be necessary.