Damn. Sorry for your loss.
I would be totally demolished if Chief Dog did that.
FWIW, he did eat some wood (dumbass), and got an obstruction somewhere in his GI tract. It wasn't a huge deal, but he threw up a couple times and wife freaked. The vet massaged it around a bit and gave him a laxative (not sure why, but he never got the runs) and was fine pretty much right after she massaged his guts.
If it was an obstruction, I'd think it would have ruptured something. Just an obstruction wouldn't make him go downhill like that I wouldn't think. I know virtually nothing about vet biology, but that's my take.