I have a 10yr. old Shih Tzu named Stevie. This poor little guy has suffered from ear and skin yeast infections for the past 5 years. We have been to the vet. for shots, pills, shampoos and antibiotics. The vet. also says he has allergies. I have changed his food many times. He is now eating Blue. I also give him antihistamines. This is just a reoccurring thing as soon as he's off the meds. Does anyone have this same problem?