I've always been told that pups are vulnerable until 6 months (providing they get their shots on time). Although I wouldn't take a puppy to anyplace with other dogs around until 6 months, I wouldn't hesitate to socialize with family, friends, etc. I am talking about having them around strange dogs who may not be vaccinated, not other family/friends dogs. I totally agree that socialization, socialization, socialization (wow, say that three times fast
) is the key with raising a companionable dog - I just say wait to have them around strange dogs until their immune system is good.