I can't remember at what age it started but Lola (6yo GSD bitch) always had bad ears - inflamed, pink to reddish, dark brown wax, always scratching them. I was always having to clean them and up the Vets to get drops or antibiotics for her ears. Then I changed vets and my new vet diagnosed her with low thyroid (hypothyroidism) about 2 years ago now. Ever since treating her for thyroid she has not had one bad ear episode. Just something to consider. But from my experience chronic ears such as you are describing are an indication something is not right, whether allergies, thyroid issues, ear mites etc. Take him to your vet for a diagnosis, I know when Lola was going through this I could tell she was very uncomfortable and was painful for her.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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