Today I got a D.A.P.collar for Olive. D.A.P. stands for dog appeasing phermone, which is a calming hormone released by mother dogs during lactation. This collar releases a synthetic version of the phermone, and is reported to cause a significant calming effect in dogs.
A friend at work suggested it to me, since she has a dog with much the same anxieties as Olive. She said that her dog is ~25% more calm with the D.A.P. collar, and I figured that I would give it a try. I am going to combine this collar with my usual clicker training to see if Olive handles stressful situations better.