Yes bones are good for them and they will love the chewing experience, unless your puppy was like my Harry when he was about 12 weeks old - gave him a chicken wing for his first time and he swallowed it whole - oh dear, but he was fine the tummy juice break it all up, he eventually learned the joys of chewing rather than just taking and swallowing.
Start with chicken wings or turkey necks, I'm sure he will love it.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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