I'm not certain what caused the internal hemorrhage but the vet said that his internal failures were not going to be cured w/ surgery and we had to say goodbye that day. Total bummer.
We've been a Schutzhund family for more than 30 years and have always had working dogs. It was very trying at times to not compare our little white boxer to other dogs we've had. For example, we have a Doberman now who's father is from the Czech Republic and the mother is from the US. That dog is stubborn but comparatively brilliant and properly motivated is amazing to watch work. He gets worked several nights a week and without that he would likely be an unpleasant animal to be around.
Our white boxer though couldn't be taught much of anything and simply loved being loved. Whomever the dirtbag is that cut him loose is also responsible for having given him a very bad first couple years. Within a day or two of finding him... taking him to the vet... bringing him home and nursing him back to health he bit me in the face.
My fault for sure as he didn't have any reason to believe that I was any different from the dirtbag. He's not here anymore but a little bit of him lives on in a scar above my left eye and oddly, it reminds me of what a happy dog he was and how much he just wanted to be wanted.