I would look into pelvic fracture. I know it doesn't seem plausible, but it could be. Lightly sedate her, have your vet do an internal pelvic exam while walking her. That should point out a fracture. You'd be amazed at what they can and can't do with a pelvic fracture. I only know this because it was suggested once to me for my mare and I did a lot of questioning about it. I would also wonder about kissing spines or some sort of pinched nerve. From what I understand, it shows up in the hind end first. Also, I would have your vet test her blood work. My mare ended up having EMND (vit E deficiency) and it caused more problems then I EVER thought were possible from nutritional deficiencies.
Last edited by Army wife; 01-04-2013 at 06:56 AM.