ok, i think my matty has ear mites. i noticed that he would get this dark crusty was in his ears but when i would take him to the groomers he would come back without it. so i assumed it was just dirty yucky stuff. but then, i was at out little bitty pet store in town and noticed they had a spray for ear mites. when i read what the bottle said, it sounds like what matty has. is it necessary to take him to the vet or can i send him to the groomer and get him shaved and then apply this stuff?