Sharlyn, SM and CM tend to go hand in hand and often it is not clear if the pain or symptoms are caused by one or the other. I suggest you read about SM as well as CM. When I started looking for answers 4 years ago, it seemed almost no one was talking about it, with any breed. People still aren't for the most part, here in North America. Since this is more prevalent in the UK, it has become mainstream media, but not here.
Even in the Breeder's Guides that give a full description of each breed and it's potential risks, I have not seen the mention of SM/CM yet!
Lastly, and most importantly, do not feel guilty that you didn't know! Oliver wasn't diagnosed until he was 4, but fortunately his symptoms were minor. It wasn't until I knew more and looked back on certain events that I understood what it was that I had seen. Be kind to yourself!
It sounds as if you've certainly been in touch with a lot of the "right" people so far. If you manage to get through this thread, there are one or two members who opted for the surgery (and not necessarily with Cavaliers). There is no guarantee with the surgery that a 100% clean bill of health will be achieved. I think it's more like 70% better than they were. The surgery is extremely invasive, very expensive and your dog would be in Hospital for several weeks (nearly 2 months). For me, and this is a very person and difficult decision, I had decided that if medication did not work, I would not make Oliver suffer any further trauma.
It takes a while to find the right balance of medication. As Toby's Mom indicated, the drastic weather event we just had could have adversely affected our Cavaliers, or sufferers of SM/CM as the changes in pressure can often trigger an event, or increased pain. Oliver seems to have sailed through it as well thankfully. Henry was just concerned about the storm itself.
