Clynch,
I had a dog that had it done. In fact , he got written up in the vet medical journals. It was because he was so young. Usually they see it in older dogs. The only reason we noticed it was because he did competition and on long swims he did what in horses they call "roaring" , a labored breathing. If he was going to just be a pet you would never have seen it. The surgery amounted to the vet sewing back one one of the flaps to keep the airway open if I remember correctly.He went on to have no health issues and competed at a top level . The only concerns I remember is that you had to be careful if the dog was the type who "Inhaled" his food becuz you had to worry about the food getting into the lungs. Not a bid deal if he eats normally.The other one was swimming since the flap was always in the "open" position. But as I said, he competed where he had to swim hundreds of yards and had no problem. I had mine done at the vet school at UW Madison.
good luck,
baumy