There are not any "vaccine preventable diseases" in dogs that can be passed on to humans. The concern with pets and humans is the transmission of parasites (intestinal), although infections and parasites on the skin can also be transmitted. Roundworm, hookworm, coccidiosis and tapeworm are just some of the more common parasites found in a dog's feces. If your dog is on heartworm preventative monthly, and has a fecal sample checked by the vet yearly, I would not be very concerned about these parasites. Some of the parasite infestations when transmitted to humans are NASTY. However, I understand that it's even worse to be exposed to parasites from wild animal feces, i.e. raccoon. My sister graduated from vet school in 2006. I was constantly asking her questions about this kind of thing, since I have two dogs and 4 cats. I've never had a problem with my kids, and they climb all over my pets and the yard. I do keep on top of the de-worming with my dogs, but the only vaccines I keep them up to date with are rabies. Dog saliva has plenty of germs in it... I'd probably err on the side of caution, although I've known plenty of people who's dogs lick their kids on the faces all the time with no ill effects.