If you lost your dog this is going to help you... hope this NEVER happens but good to know in case it does!
socialization is truely important. sometimes people do more harm than good when sheltering a puppy, thinking other dogs or people may scare it. they will asociate those situations with bad emotions and may turn aggressive if terrified. its best to introduce a few new things a day. this way the puppies will grow into socialized adult dogs with great manners.