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actually, there is a LITTLE bit of truth to the cropped/uncropped thing.  longer, floppier ears are going to trap more moisture in the ear canal which can lead to ear infections.  however, MOST ear infections are caused by allergies so it won't matter if the ear is cropped or uncropped.  the gentian violet wash mentioned above is really great.  i would wait until the vet checks the ears before starting, though, just to be sure it is an infection and not mites.  otherwise, try that wash 1-2 times a week and hopefully that will be enough to control the problem