Looking for advice. My basset is 20 month old male and has a history of yeast infections ears, skin and internal. I am looking to find out why and what to do to prevent it. He is on a good dog food science diet he gets plenty of exercise a two and half mile walk every morning and one to two hours in the dog park every afternoon. Will a change in diet help or is there something I can add to his food that will help. The vet says I can put him on a prescription diet but I do not want to break the bank.