Need some suggestions

Sandy has started to go under our bed - she hasn't done since we got her a year ago. We have it blocked off, but the smart little dog that she is has figured out how to pull them out so she can crawl under there. Its actually funny coz she can barely fit. She has to pull herself in on her side with one paw.

But I need to stop her some how so what else could I used besides storage boxes?

Loki does this as well, and he is getting to big to just shuffle through like he used to. We are considering putting a decorative 6' moulding around the bottom of the bed so he cannot get under it anymore.