Is a puppy thing for sure, actually is an adult dog play thing as well, I'm just now watching my 2 fully grown GSDs playing, mouthing and biting each other (they have bite inhibition) and they are loving it. Is perfectly normal play, however if you don't like it (and I don't blame you) I had great success with putting Vicks Vaporub on my arms and ankles to stop mine from mouthing me. The smell is so strong and yucky, they hate it and as soon as they go in for a nibble the smell stops them and they eventually learn to not bite you. Just DO NOT put it on your puppy or make your dog lick or eat it.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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