It is quite a common thing for dogs to smell you when you come home. ... Exactly what they tell him, well, only he truly knows, but smelling you is his way of finding out what was going on where ever you've been while away from him.

What do dogs smell when they sniff you?

They also allow dogs to detect a complexity in odors that humans can't. You might smell chocolate chip cookies, but your dog can smell the chocolate chips, flour, eggs, and other ingredients. And when dogs sniff another dog, they smell more than doggy odor.

How do I stop my dog from excessive sniffing?