Hi! and welcome to YT!! And congratulations on being a first time puppy mommy. I think I am safe in saying that your Yorkie is normal. This seems to be common behavior in our pups
Just wanted to say that AprilLove used to do that to, now she is 15 months old and doesn't do that, but she does bang the back of my heels with a squeeky
toy when she wants me to play!! lol