It’s easy to blame things on the dog. Chewed furniture? Yep. That mystery puddle on the floor? Sure. Being a slobbery, disgusting vehicle for germs entering the house? Definitely. But as you’re wiping dog snot off your windows for the billionth time, look on the bright side: the microbes brought into the house by dogs are actually helping our immune systems. Kids who grow up in households with dogs are less likely to develop autoimmune diseases and allergies – potentially due to the diversity of bacteria brought into the house by Fido. What about cats, you ask? All we know for sure is cats couldn’t care less if you get sick. Here are the 5 most popular dog breeds IN THE WORLD!