The puppy is better off being socialized with the mother/littermates than with new homes as a rule. I won't let any go until 9w. I am guessing that breeder is using the newer, later vaccination protocal and making sure that they have adequate immunity before releasing them. As long as they are being exposed to things at the breeders home, 10w is not late or missing any critical socialization time with you.

The dogs that grow up the worst are the ones given over at 5-6w of age. They miss critical time with their dam. Having had a litter here and watching what Cinnamon did with them, I understand now. There is no human who can do what she did.

I promise my home is better socialization than any other home. Between my kids, the kids who come in and out, the dogs here and having the dam with the puppies until they leave, no home can give what I can.

A puppy will bond with its new owner pretty much at any time. you have a small window for the dams to really teach the puppies dog manners