Hi Ebbie,

I've heard of a technique for dealing with separation anxiety that involves leaving for short (as in 5-10 seconds) periods of time to begin with, then gradually increasing it -- so that your dog will learn to automatically associate your departure with your return.

Apologies if you've already tried it, but here's a link, in case you're interested: http://www.paw-rescue.org/PAW/PETTIPS/SeparationAnxiety.php

Good luck!