It can be seen from the socialisation dates that it is important for the puppies to go to their new families earlier rather than later, ideally at 7-8 weeks. By this time they are weaned and it gives time for their new owners to get them used to their lifestyle.
It is really important that the new owners continue your good work so take time to explain what you have been doing, and suggest they find a good puppy socialisation/training class. At Martin & Carr, we run parties that puppies can attend as soon as they have had their first vaccination. Owners can also take their puppy out to see traffic, open spaces, horses etc, although they must carry them until their vaccinations are complete. It is possible to undo all your work by not giving the puppy a suitably stimulating environment in those crucial first weeks.
We produce a leaflet for owners of new puppies and can provide them for you to give to the new owners. It is also a good idea to give a written list of the diet you have been giving the puppies and worming dates, in the excitement of collecting a new puppy it is easy to forget verbal instructions!
Sometimes the new owners will ask you to keep the puppies until they are older because of pre booked holidays etc, this isn’t advisable and you should really look for different families and the purchasers should wait for a puppy from a different litter.