What Is Best Treatment For Skin Allergy, Excessive Licking And Sometimes Smelly Ears In Springer Spaniel Dog?

My Vet has prescibed predisone 25 mg for 52 lb. dog. To be taken periodically for what we think is an allergy. Vet said to give dog break from meds, then resume in a month or so. It takes about 6 weeks for the dog to develop symtoms again. Tresaderm is prescribed for the ears. [...]