Would you mind telling me more about Piper? I didn't know gas could be potentially fatal.
I'm sorry if I scared you. I wanted to shorten a long and horrible story, and I left too much out. We were so flummoxed for so long...She seemed to react badly to things, including most meds, and went through various bouts of gas and one of HGE. She also gradually stopped eating--I chased her appetite through all types of food. For a while, we treated for severe IBD. After we said goodbye, the vets found yellow skin on her belly and inside her ears, and concluded that she probably had intestinal cancer that spread to her liver.
I'm not sure, but I don't think gas is fatal w/o torsion. But whatever is causing the gas--even the wrong food, if the dog is sensitive enough--can cause other very dangerous conditions (like HGE).
I'm glad your boy is home. I hope he doesn't have another episode, but if he does, I hope you can pinpoint the cause.