Puppy Socialization

Good dispositions are both born and made. Both Nature and Nuture are part of the equation. Although responsible breeders will only breed from dogs with appropriate dispositions, pups must also be socialized correctly! Commercial breeders as well as individuals without the time or motivation to properly socialize their pups are doing both the dogs and their eventual buyers a huge disservice. It's impossible to go back at a later date and make up for lack of appropriate socialization.
Pups should be handled everyday from the very beginning, and there is a set of exercises that are extremely helpful. Check out the link to the puppy socialization article as it explains in depth the importance of correct socialization.