I have learned over the years that young puppies should not be over-stimulated; some breeders raise puppies inside their busy homes and such stimulation can result in hyper, crazy dogs. Considering, we have a separate nursery building that has a controlled environment for the puppies. As they age, we gradually introduce them to people, children, other pets, radio, startling noises, etc. We also use an Early Neurological Stimulation Practice with our puppies to boost intelligence and enhance their training. This practice is described in further detail in the following question.
Temperament and Socialization