Well, I have sad news to report. My vet spent quite a bit of time on the phone this morning with a vet from Tufts University Large Animal Hospital discussing Target's condition and blood test results. This second vet felt that his results were so far "off the charts", that with his history of colic surgery, plus his age and recent weight loss, that there was very little chance of a positive outcome with treatment. Of course, she wanted us to put him on the trailer and truck him 2 hours up there so they could use him for study, but my vet actually declined for us. So Target has been buried on the opposite side of the pond from his buddy Max.
As a friend just posted on FB: Some horses come and go, and others come, leave hoof prints on our hearts, and we are never, ever the same.