I have loved reading all these responses. I am happy to discover that Ruth and I are clearly in the mainstream of CP. As a group, none of us obsess about dog germs. I suspect that some guests/visitors to our homes may be horrified by what they see, but that is their problem.
If we have put out cheese and crackers, et al, for our guests, I will always have a container of hand sanitizer nearby, so that, for the sake of guest sensibilities, I make a show of hand cleaning after touching Simcha and before touching any of the food.