My neighbor's dog does the same thing. Jasmine (a beautiful 4lb yorkie)knows that if she goes potty outside she will get a treat. So what she does is act like she is pooping. But when you go to look there's nothing there. She knows she gets a treat for pooping outside. Smart little buggers!
Jasmine's owner doesn't like a lot of people picking her up (mainly strangers that Jasmine doesn't know or very small children...very protective of Jasmine). Jasmine is very sociable and lovable. So if Jasmine wants to get picked up by someone, what she does is go sit by her mommy and slowly inches her way over to the person she wants to be picked up by

. Each time she inches her way to them, she stops and looks back to see if her owner is going to stop her.n she realizes her owner is not going to stop her, she inches up another step or two. This goes own until she is sitting in the person's lap. My neighbor and I watch this all the time and it cracks us up everytime Jasmine does it.
By the way Jasmine is the reason I got a yorkie, I used to dog sit her and absolutely fell in love with the breed.