To help manage the symptoms (not a cure), here are a couple ideas:
A belly band will save clean-ups for you. I ordered one for Rudi when he first came into our home and was marking. Once it arrived and I tried it on him.... I never had to use it again! He just stopped marking! That's beside the point for the purposes of this discussion, though.
I ordered the belly band from this group because it is sized specifically for the dog and it helps the rescue effort. It was very well made, an adorable material (you can tell them boy/girl), and I wound up shipping it to a friend to use for her dog. I purchased men's incontinent liners to use with the band.
http://www.petorphans.com/bellybands.html
IF your dog seems to be more quiet by your tightly holding him/her, there are dog body wraps that some folks use to calm their dogs during storms. Sorry, I can't put my finger on a link for this right now.
In lieu of purchasing that wrap, you can use a t-shirt sized for a snug fit on your dog and tie a knot to tighten it around certain parts. The idea is to have the dog wear something to give a secure feeling.
Don't know if it would provide long-term relief for this condition, but your dog certainly would appreciate a session of Tellington T-Touch if you are fortunate to find a practioner in your area.Here is a T-Touch body wrap that would be easy to apply:
http://www.crvetcenter.com/bodywrap.htm
These things in combo with herbs, etc. may make your dog(s) more comfortable. My two pups are 11.5 y/o and I am constantly looking at them for any signs of cognitive dysfunction, so this thread is particularly interesting to me.
Nothing happens.....but first a dream.
Carl Sandburg