My first greyhound developed some back end weakness when she was about 11.5 Based on the standard LS test, it wasn't that, but x-rays showed (layman's terms ) the cushiony stuff in several of her vertebrae had worn away, so that when she moved the wrong way, the bone rubbed/pinched a nerve. Hers came on very suddenly, she had had some minor arthritis and suddenly one day she was in pain and could barely walk. Steroid injections gave her immediate but temporary relief. She was put on Metacam which helped, but a couple of months later she had another "episode" where she suddenly couldn't walk at all, could barely stand. I was sure I would lose her, but the steroid shot worked again, and I started her on acupuncture. That saved her life. In about 6weeks, she was 80%-90% normal. We did do Adequan shots as well, the first one helped while the acupuncture was kicking in, after that they seemed less effective, so we stopped. She also had a heart condition, and I lost her at 12.5 to complications from that, but right up to the end, she was walking just fine.
So, not information about LS like you asked, but I hope this helps!