Yorkierini, I found a good site that can explain it better than I can
www.breedbetterdogs.com It's basically a series of things you do to stimulate puppies starting when they are very young and it improves so many things from circulation to socialization. I know some breeders especially with tempermental breeds are finding it essential in better dog temperment and making them easier to handle.
Sorry I don't know how to make the site address a link.
