Heh - I have this problem too

Got my new rescue dog trained to stay off the furniture but every so often, I'll get up in the night and come back to find her on the bed.  This hit home:

Mostly, she and Bear will go outside while I am in the bathroom and when we come come back into the bedroom, Truffle will walk over and plop herself down in Bear's bed. Bear sighs and curls up on the throw-rug (Truffle's bed is a lot smaller).  Later, Truffle will move but this is just one part of her trying to claim Alpha of this pack. Not gonna happen but she still tries - had her for about four months.  Turning into a really great little pup otherwise...