I would offer the following advice: Stop feeding soy, wheat and corn. Diamond makes a good line of foods that have none of these items in them. You can buy in bulk and save money.
Many long-eared dogs are prone to yeast infections. If this is the case with your dog, you could try over-the counter products used to treat women's vaginal yeast infections, such as Monistat (I buy the generic version). Just squeeze some of the cream on to a soft cloth and thoroughly wipe it in the ear, and then massage the ear to make sure the cream gets down into the ear canal. You can do this several times a day.
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