What you're talking about may be like my own GSD pup. He was raised in kennels, but that doesn't mean they are isolated from human contact. Someone probably feeds them, plays with them a little, they see other dogs and people coming and going. The breeder I got my pup from would bring in a puppy or two into the house for a while. Someone was always holding a puppy. So, they were somewhat socialized. Then I did the rest when I brought him home. He was a lovely, stable dog and actually, more outgoing than a GSD typically is with friendly strangers. As a dog behavior consultant/trainer, I have come across a fair number of dogs I felt had been denied ample socialization. They all had some kind of issue...either fearfulness to one degree or another, a lack of that bouce-back after being startled and some were those tentative biters you see sometimes. So, when we use the concept of socialization or the lack thereof, maybe we're identifying it differently. (?)
Here is the American Veterinary Society of Animal Behavior's statement regarding socialization.
http://www.avsabonline.org/avsabonline/images/stories/Position_Statements/puppy socialization.pdf
Here is the American Veterinary Society of Animal Behavior's statement regarding socialization.
http://www.avsabonline.org/avsabonline/images/stories/Position_Statements/puppy socialization.pdf