Great! Thanks Peter. When a dog streches, yawns, shakes or lick his paws often it's a way for them to be dealing with anxiety issues (all these actions are very self rewarding and make the dog feel relaxed). Sounds like your doggy is doing just fine in that department, if he had some anxiety issues, I would tell you to teach him those actions on command.
You still didn't tell me why you need to reach for his collar, or where he was bought from. These are pretty important questions too.