Errrrmmm, you all are aware that vaccinated dogs can still be carriers of disease? That the point of vaccine is to stimulate the immune system so it "knows" how to fight that particular disease, that a dog can be exposed to, and become a
carrier of a disease, but not develop it? That an unvaccinated dog is no more or less likely to be a carrier than a vaccinated one? All the vaccines do is give immunity to
developing the disease (hopefully--I have seen Parvo and KC vaccine fail enough times to lack confidence) if exposed, but does not create a golden bubble around the dog where it cannot also pass it along.
Just throwing a wrench in the works here
Since vaccinated dogs can also shed viruses without anyone ever even knowing that the dog has been exposed to, let alone carrying a disease, then the point of not allowing dogs to mingle with unvaccinated dogs becomes irrelevant.
Makes the decision making process that much harder.
With puppies and immuno-compromised dogs we just have to excercise common sense and do what each of us feels comfortable with, with the information we have.