What does your dog smell

I am reading a book right now- Merles Door - Lessons from a Free thinking dog-- and the author posed a question thought I would share. If the nose is the strongest sensory on a dog. That is how they figure out almost everything they meet. What does your dog think of YOU when he sees you. There are some days I can come in from the shelter and everyone says Hi but no big deal. But if I have spent a lot of time with GSDs-- I will get checked out extremely close. I always am wondering what are they thinking. Think about it.