You should see a vet, they can give you something for ear infections. With our cocker's chronic ear infections we got a bottle of medication from the vet and it lasted a long time. The initial visit cost's money but after that we just had to pay for the medication refills, which was like once a year. I don't remember the name of the stuff anymore. Ear infections are painful for the dog and there will be plenty to treat throughout the life of your cocker.