I know with Heidi (the second time) we started treating for back, but quickly realized that it was actually muscular, and kept her on restricted movement for a few week (off pred) and she was fine. It's so hard to tell without an MRI sometimes!!! But MUCH better safe than sorry. Ferk is supposed to be crated for her back legs, but with only a little bit of life left, I'm not doing it. Bad owner, maybe, but she's not spending her last time in a crate!!!!!!!