Who's been sitting in my chair?

My dog, F.H, has recently been sitting on my side of the sofa.  He has one side, I have the other.  But for some reason he has been sitting, or sleeping, in my space.  What's up with that?

Not only is he sleeping in my spot, but he has also taken my crewel embroidery pillow, that I put behind my back while I am hand sewing at night, and moved it to .............

HIS BED!

So when he gets tired of sleeping on the sofa, he moves to his bed!  Who's in control here?????