Concerned that Fido might catch your yucky winter cold? Or that petting Kitty could spread your nasty flu germs to others in your household? When we're coughing and sneezing, we know to stay away from other people. But do you need to stay away from your pet, too?Not at all, say preventive medicine experts at Vanderbilt University Medical Center. In fact, "pet therapy" might be just what a doctor would order.