Probably the best advice we received was to leave Millie alone for 15 mins before we left her and 15 mins after arriving home (we still have to do this or she jumps). We also would drop treats "out of the sky" when we were getting ready to leave (this was the time that produced the most stress)for her. This actually seemed to be the thing that helped her the most. Of course, we also stopped crating her around that time too.