It wasn't all for naught....
That bulldog thread was the one that convinced me to permanently nix any ideas of cruising with a dog. That and the thought of having my springer spaniel bouncing off the cabin walls....no fun for either of us. I sail to relax..
That said, if you check out catalogs from places like Cabelas and Bass Pro Shop you'll find several means that people have come up with to get their dog back in the boat when waterfowling. Most if not all are made for freeboard much lower than that of a sailboat but they could be modified easily enough.