[anonymous]

“It might just be that he is sensitive to them and it’s not a full blown allergy”

That is an allergy! Only an intradermal skin test performed by a veterinary dermatologist can determine how sensitive your dog is to the allergens and what if any treatment is recommended.

Here is a good article, keep in mind there are even newer treatments available since the article was written
http://www.nevetdermatology.com/canine-atopic-dermatitis-treatment/