[QuickSilver]

I think some posters are referring to a "submissive grin." If you can get video, or check out the pictures and characteristics that define a submissive grin, it would probably help.

If he is approaching you as you describe, he is probably just showing exaggerated deference to you because of past experiences. My little guy is super-submissive, and he licks his lips a lot. I can always hear him coming, because he's smacking his lips so loud. I think that's partly just the way he is. I also try not to pressure him in dog language - I generally do not approach him, or lean over him, or make a lot of direct eye contact. If it is a submissive grin, your dog may get more comfortable over time.

There are also other signs that show a dog is relaxed. Those included relaxed muscles, blinking eyes, and a slightly opened mouth. If your dog is acting relaxed, I wouldn't worry about the submissive behavior.