Some allergens are airborne, like I said, impossible to avoid.
In the summer these allergy dogs do best in air conditioning.
At one point I had an air purifier and a dehumidifier going (all went to the Goodwill), even tried raw food (disgusting and caused an emergency vet visit) absolutely nothing worked till she saw the dermatologist.
I also had countless shampoos and creams going on, all a waste of money.
The Malaseb did nothing until it was used in conjunction with other treatments prescribed by the specialist.
Allergies are very complicated and every dog is different.
Here is a good article about what you might be looking at, keep in mind there are even newer treatment options than when this article was written
http://www.nevetdermatology.com/canine-atopic-dermatitis-treatment/
