Besides the one Nancy posted from Foxstone Maltese, here are a few more for you:
Be sure the pup is old enough to go to a new home. The ideal age is 9 weeks for most breeds, but small toy size dogs may need to be as old as 14 weeks before their breeder will let them go. http://www.knowingdogs.com/Images/Ch...our_Family.pdf
See page 15:
Small dogs, big hearts: a guide to ... - Google Books A good breeder will not send you home with a puppy under the age of 8-10 weeks old, this goes even further for toy breed dogs. A toy breed puppy should not leave the breeders home until they are at least twelve weeks of age. Up until this time, the puppy is in a crucial socialization phase and should not be separated from the litter. A breeder who sells puppies 4,6 & 7 weeks old do not have the best interest of the pet in mind. noselicks.com - Articles - A Good Breeder