Welcome to YT. Glad you found us.
Have you looked into accupuncture treatments? I go to an accupuncture vet because I found him when I had a Bichon that had a stroke. I was going to have to put my Andre to sleep & accupuncture worked! The dog who could not walk, walked again.
Here's a link to his website & what others have found with accupuncture - some with back concerns:
http://www.apvet.com/testimonials.html
But I know you're not around here, so below find a link to finding your own accupuncture vet
http://www.aava.org/pub/city.html