Are dog allergies a thing? Yes. Dogs do have allergies too. Generally, dog allergies are divided up into three categories: Skin allergies Food allergies   Acute allergic reaction  Skin Allergies Skin allergies or allergic dermatitis rank as the most prevalent allergic reaction in dogs. They are caused by one of the following three: Food allergies  Flea allergy dermatitis  Environmental allergens  These allergies may present as itchy skin, resulting in skin becoming red, inflamed, and scabbed. Flea allergy dermatitis is caused by fleas while environmental allergens like pollen, mold and dust may cause atopic dermatitis or atopic allergic reactions.   Food Allergies  Actual …