Is this something they wanted to do, or wanted to avoid?? I want my dogs to meet virtually every dog they see, unless the other is aggressive.
http://dogtime.com/dog-health/general/1498-puppy-adolescence-dunbar The whole article is a good read but the de-socialization is at the end.
Good article! I have a lot of respect for Ian Dunbar as my first introduction to positive training was taking his Sirius Puppy classes. His classes were really effective and so much fun for the puppies and the humans.