Another vote for EpiOtic. I'd really suggest using it as a preventative because once the infections take hold it's misery--for you & the dog. Our Springer had terrible troubles & once in awhile, the yeast infection would take hold & cause him extreme discomfort. His original owners never cleaned his ears (he had a terrible infection when we got him--his ears were cracked & bleeding & it took forever to clear up), so he was not fond of having it done. Get the pup used to it now, when he's not uncomfortable so it doesn't turn into an ordeal.
As the arc of history bends towards justice, it's a new, more progressive day. --Steve Benen, The Maddow Blog, 11-07-12