He's Supposed to do That!

So, I see this guy walking his dog along the lake near my house. Every time the dog wants to stop and smell something, he yanks on the leash and says, "no!" So, correct me if I'm wrong, but don't people walk their dogs so that they can smell things? At the rate they were going, the dog would have to crap while actively walking. He's a dog, he's supposed to sniff things!! That's how his brain is wired! If you can't take the time to let him be a dog, then don't have a dog!