Hi,
I'm sorry you're facing this dilemma, I hate my dogs getting older with the issues it brings. There are a few who have or have had dogs with laryngeal paralysis. One of bett's dogs has it now, one of JenC's dogs had it, can't think of who else. Don't recall who may have had the tie back surgery. Here's one thread I found on it, by someone whose dog was going to have the surgery. I don't know the link to the Yahoo group, but maybe you could search for it. Good luck with your Sadie.
New Here! Lar Par surgery tomorrow
Maybe this is the Yahoo group and it appears to get the most info you need to join the group:
Yahoo! Groups