Our expert says:
There are a number of reasons for a chronic ear infection - parasites, something within the ear (grass/debri), resistant bacterial infection, yeast or fungal infection, anatomical defect within the ear canal. With the breed and age an underlying allergy (food/pollens) is also a very important consideration.
Further assessment would be an ear swab for cytology and culture, x-rays of the ear canal, and skin biopsies (looking for possible underlying allergies).
In these cases a specific diagnosis needs to be made and treated otherwise the dog can end up with chronic end-stage ear disease that requires surgical removal of the ear canal.
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