There is no problem with feeding your puppy adult food. I have always taken them off puppy kibble around the 3mo age and given them the adult version. By doing this assists in growing them slowly because they will not be getting the higher levels of fat and protein etc and by growing them slowly may help with not developing issues you see where a large breed dog has grown too quickly ie dysplasia.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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