there's also this I got from my holistic vet.
http://www.nextag.com/duralactin-can...831717A3EE5CCD it is milk based
I can't remember how Keeg did on it vs the DGP tho.
That's another thing you might want to look into - chiropractic and/or accupuncture. It won't fix it but it will help with the pain, Keegan will tell ya.
I can ask my vet if she knows of any up around your area if you don't want to drive here.
www.sycamoreanimal.com but she gets people from all over the state.