Update 7 PM 9/6:
It did not go well. When we took him into OSU they took him in the back and he was in respiratory distress. The vet at OSU looked at his XRays and while the esophagus was a concern, he sees something in Ranger's chest

that is pushing his trachea up--hence his breathing problems as well as the food thing. He is suspicious that is might be something called canine lymphosarcoma. I've done a search on this and it is not curable. Surgery and chemo (doggie chemo!) prolong the life of 80% of dogs, but only for a year or so.
I went back before we left to come home (they are doing tests, etc. and need to keep him overnight at least) and he had an oxygen tube up his nose and an IV. He actually stood up and tried to lick my face. It about killed me. I kissed him goodbye once for me, DH and each child, just in case.
Dad and I have already decided that if it is lymphosarcoma we will probably just put him down. Chemo is no way for a dog to live, plus unless we could get it done up here (OSU is 2 1/2 hours away) it wouldn't be feasible with everyone working. Plus it only buys you a year or so. I just don't want him to suffer. He looked like a very old dog this morning and he is only 5. They asked what they should do in case he stops breathing during any surgery. We said drugs or chest compression, but no open chest heart massage.
The kids are all upset, I'm trying to keep them strong since we have no definitive answer at this point. They want to say goodbye, but I told them how he had to struggle to get up and see me, and if they all went in to see him crying he'd just get anxious and upset.
They are to call my cell tomorrow when they have any news or diagnosis; I can't DIS at work but I'll update as soon as I can. Thanks for all of your support.
Robin M.