This wonderful ritual of sniffing other people's pops, which for some reason embarrasses some people, is a very important part of introducing the dog to congeners.

The smell of the dog can tell you the sex, readiness to reproduce, age, health, what the dog ate, what is his emotional mood, and in general how cool he is.

Because dogs are as cool (or dominant) as they are humans and can tell by the smell of a dog whether to mess with another dog or not.

Did you know that when sniffing a dog will wag his tail, spreading the scent even more, and a shy dog will wag its tail to hide its scent and thus "hide" from others?