Finished may be a sales descriptive term meaning the dog being inquired about / offered has reached the mastery level of skill invalid in it's trade and having proven itself to be of this level of skill for a long enough time as to provide some measure of Garuntee that it will not be useless once removed from it's pack.
As for my personal opinion, I believe the measure of finished dog is read by looking at his handler/breeder as much as the dog.
I can't say I use the word finished to describe a hog dog ...I just say the dog is a good hog dog... and a good hog dog to me is a dog that can find a hog and bay it and stick with the track and put a hog at the other end of the track...and the dog does not trash...
I think some folks take the term finished a little too serious. To me its just a term used to describe an older dog thats trash broke, and can consistently find and bay hogs in any terrain or conditions.
all of the above is a finished hog dog to me...but a dog must not be a cull and he should produce pork and should be totally broke off trash...but to have this type of dog he needs to be hunted right at least once a week if not more...