I didn't need to look any further after "No Health" guarantee. I would move on. His size does not affect anything, some puppies develop slower and he could even end up being the biggest in the litter. The fact that he will not be coming with a health guarantee instantly makes me run the other way.
Ps, you will not find a GS puppy without high energy
They will all need plenty of exercise every day regardless of pedigree.
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