Dr. Cecilia Friberg, a veterinary dermatologist in Chicago, prescribes daily bathing for some of her canine clients with allergies.
The rationale behind this is that some allergens are absorbed through a dog’s skin. So bathing can reduce the amounts of allergen being absorbed. However, it will only reduce the allergic symptoms your doggie is suffering from when indeed the allergen is in his surroundings (environmental and contact allergies).
Most dogs don’t like bathing and regard it as cruel torture. You can train him to change his attitude. But before you start, please continue reading.
When the substance his immune system is overreacting to is a particular dog food ingredient, then please save yourself the trouble of daily bathing your dog. Or don’t you get wetter than he gets? 
When your dog is suffering from allergy symptoms then go and see your veterinarian. He (or she of course) can advise you and there are several dog allergy tests that can be done to pinpoint the culprit.
