 I don't know if I've specifically asked him. I know he's laughed, too, because his parents, same generation as mine, and they used to always say it. Now, this is gross. This is disgusting. My niece and her family do this, kiss dogs with their mouths, or they'll share ice cream. I am such a germ freak to begin with. A dog's mouth is cleaner than a human's, and you'll hear people saying that all the time. But it's not? That's not true at all. Canine mouth contains 53 types of bacteria, while humans only have 37 types.