I think if you weight it for an 8mo, it should only be minimal, maybe wait until after 1yo to weight, however just wearing it with no weights may have favourable outcomes - dog may be more calmer.
For fully grown shepherd, in each side of the backpack I started with 500gm (full water bottle), then 1kg, then maximum I ever used was 2kg in each side.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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