A distant friend of mine (who I seemed to have lost touch with) had this surgery performed on her Newfy. Her pup couldn't have been more than a year or two old at the time, but I believe the surgery was a success. Sorry but I really don't have much information beyond this. It has been many years, but I remember it because after the surgery she talked about driving 100 miles away three times a week so her Newf could go to rehab at a pool specifically for canine rehab. Kinda cool that her Newfie could go to water therapy class, but THAT too was rather expensive.
I know most vets will generally work with you on financing, but I'm not sure about fairy godmother organizations. Is the surgery an immediate thing? In the next month? In the next 6 months?
Wish you the best of luck.
Jason