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Ear infection is back for the 4th time this year — is there an underlying cause?

My 4-year-old Cocker Spaniel is on his fourth ear infection of the year. We treat it, it clears up with the ear drops, comes back 6-8 weeks later. Vet has been treating each one individually with Otomax. I'm starting to wonder if there's something else going on. He eats grain-in…