They do grow at different rates, at 16 weeks you would want your pup to be gaining around 2 pounds a week up to about 5mo then around 1.6 pounds per week. 30 pounds is a good weight for a 4mo. Don't stress if he doesn't gain in a week, just monitor him and if he stops growing over a few weeks then I would seek medical advice.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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