Lost of our girls last night

So sorry to hear of your loss, Doug and Ernie.
I'm tending to agree with 512Stroker about the Torsion ('twisted stomach'). I lost an Irish Setter years ago from this. Came home from work and found him gone.
Vet said there's nothing you can do unless you catch it immediately. It happens to deep chested dogs that gobble their food and then go out and run. Their stomach starts swaying as they run and eventually flips, twisting both ends and shutting off the blood supply.