Colds

Why do humans get colds and dogs do not? A few days ago I came down with a cold as did most of the people I know. Some say it is change of seasons. I say it is from a germ. Weather has nothing to do with it. As I was walking Shelby this morning, I realized that he never gets a cold. No dog or cat gets one. What is it in their immune system that repels this virus? Maybe scientists need to delve into this theory. Do dogs and cats have a cold resistant gene or do they not get colds because it is impossible to blow their noses with paws.