Have you read the Purdue bloat study? It's not terribly useful at shedding light on what truly causes bloat, but there are a few correlations that stand out to me -- situational stress, overall temperament, and the relationship between chest depth/width (deep and narrow = more likely to bloat; that describes my Finn).
I feed raw and have never seen symptoms of bloat after feeding a raw meal. It just doesn't expand like kibble does, plus it forces dogs to slow down their eating and not inhale so much air. The Purdue study found a correlation between kibble preserved with citric acid that was soaked in water (that kibble was preserved with citric acid) and the use of raised feeders.
All I can say is that when your dog is truly bloating and it's a genuine emergency, you will know it. They truly do not look or act right. Go with your gut feeling. If you suspect bloat (vs. just gas), it is critical that you get your dog to an emergency vet ASAP.
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