Let me see if I can find some studies for you - I am just setting up a new laptop and I hope that my links are still here.
Generally accepted practices and what the YTCA says are noteworthy - again in my opinion. But I know there have been studies done - just got to find them for you.
My personal concern is the weight of the toy dog being over 2lbs prior to going home. Also many breeders do like to give the first set of shots - I also like that as number one they get to deal with any adverse reactions any young pup might have.
I know that seven weeks is considered okay for the large breeds - how-ever some other factors come into play - such as if you are trying to export the puppy to a foreign country - that might not be legal under 8wks old. Also the USA recently changed their import laws to require pups be vaccinated against rabies prior to entry. And you can't vaccinate Rabies under 3months old....
As a large dog breeder the norm is between 7-8 wks old - at that age my breed is anywhere from 14lbs-20lbs... We do like for the pups to be placed and the bonding and obedience training begin in earnest with their new owner.
How-ever all my yakking is somewhat off point as we are talking about the toy breeds. Let me shut up now and try to find some research:-)
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