He is far too young to have left his mother and litter mates. I've also very surprised that your vet didn't mention his age as being a problem. The YTCA states:
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All puppies leaving the breeders possession will be a minimum of twelve (12) weeks of age to facilitate adequate socialization as well as appropriate emotional and temperament development through interaction with siblings, dam and other dogs.
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I have no experience with a puppy so young but what I do know is that one of mine was sold too early and she has many socialization issues.