Puppies are just completing the weaning process at 8 weeks. Sending them to new homes, new environments at early age and so small, they don't eat well the first couple of days and it's asking for trouble.
There is also the fear factor periods, 8, 12 and 16 weeks of age. You don't want to do anything out of the ordinary at those stages.
I'd prefer not to have new owners deal with anything going wrong and only deal with bonding and loving a new puppy.
__________________ Mardelin Yorkshire Terriers |