Average weight of large breed puppies at 8 weeks old?

Hi,
     We just took Hudson for his check up and first jab which went well and he is all healthy.



But when the vet weighed him he was only 4.2 kg or 9.5lbs..., I had a quick look online and it says average weight for an 8 week old make Akita should be 15lbs +.... Is he really small for his breed? Should I be worried?



Finally he looked like he was humping his bed earlier, do they start humping things this early?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.petforums.co.uk/threads/average-weight-of-large-breed-puppies-at-8-weeks-old.278591/

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