I have girl with thyroid issues as well, before treatment she was constantly scratching herself, she always had bad ears - red sore and always scratching them.
I have since put her on Oroxine (similar to Thyorixine), depending on how bad she is as it can flare up especially in hot humid weather, she gets 1 to 1.5 tablets twice a day. She no longer has bad ears and rarely scratches.
The other thing I found helpful was giving organic virgin coconut oil twice a day, they get about 2 tablespoons now, although started them on 1 teaspoon. CO helps as well. Also organic dried seaweed helps with thyroid
If he has thyroid issues and it is hot and humid where you live, you might have to increase his medication.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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