I have a question .... I have a six year old male working Rottie who seems to have an issue with his ear. He is forever shaking his head. I've taken him to the vet any times and physical as well as aural swob tests have always shown nothing at all - Not even redness. His ear lobes can also sometimes get a bit swollen but not always. Does anyone else have this issue with their Rottie or any other large breed perhaps? He does seem to be grain intolerant and I feed him (for the last five years) on grain free food which he likes and he has no issues with .... BUt now I'm thinking maybe he is allergic to something. What do you guys think?