My dog also does this when I scratch her back: should I be concerned?

My Regular Bull (in this video with me) captioned this for me!

New week starts with new home made photoshoot 💜 this time

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone

So here’s my 🍑! Every one does this when they are alone