Our rott is about 7 years old he started getting ear infections 2 years ago. Vet gives him antibiotics but once those are used up bam he gets again. He has been on this cycle for a while now. I have tried hundreds of home remedies and nothing keeps it away. The vet is basically no help at this point two vets that is. I have even changed his food. Several times. Could an immunity supplement help? Any ideas?