Without a picture hard to say... but most of the time flies will go for the outside of the ear... not opposed to nibbling the inside too. Best bet would be take the dog to the Vet. If it's outside all the time could be anything from an allergic reaction, to flies, to who knows what!
For a office visit and meds... better to be safe.
Susan
For a office visit and meds... better to be safe.
Susan