This is not about making all risk go away. It is about getting that very strange breed of people, dog owners, to accept that their charges are not welcomed by everyone in spite of their "don't worry, he's only playing!" mentality. The risks presented by dogs are very preventable. I write as someone who has spent a happy time this very day wheedling dogshit out of the tread of my shoe with a matchstick. Fortunately, I spotted it before entering the house. If you think that my annoyance at this has anything to do with advocacy of a nannying, risk-averse society, you clearly ought to have the odd adventure out of mental health practice every now and again and swot up on communicable diseases a bit more. Quite an eye-opener, I think you'll find. Unless your eye is infected with Toxicara, of course.