my dog was diagnosed with yeast infection in his ear, I used the vet med., I consulted a pharmasist, who said I could use female yeast med. It was basically same. Now, its been years, of course, but his ears are so bad, the left one doesnt have an open ear canal. I cant afford the $100 dollars just to walk into the vets office. Am I really messing up my dogs life? Please help...