Am I correct that gastric torsion is the same as bloat?
If so, that's what I'm really afraid of with my big girl (German Shepherd/lab cross???).
Apparently there is not much you can do to prevent it. They say some foods might cause it more then others, also you should feed two or three times a day instead of all at once. Feeding from the ground is healthier than from an elevated dish and no exercise for one hour before eating and for two hours after.
I try to go by that, but I'm still concerned, because my dog is so hyper, I can't keep her still for that long...
Again, I'm really sorry about your girl and hope your boy will be fine without her.