An acquaintance in my area is raising money for her apparently very nice kid-friendly horse to have this Laryngeal Hemiplegia surgery done at a nearby vet college. Says horse was born with condition, both sides, and gotten worse now that older; horse losing weight. I see a few older posts that say it is usually successful and horses live fairly normal lives afterwards, but am wondering if there is any more up-to-date information about this type of surgery and its success rate. She says horse would have to be euthanized otherwise, which doesn't seem like a good ending, although horse is 19 year-old Arabian. How long do they generally live? Any thoughts to help me decide how much to give her? Thanks!