[header] How to detect and prevent bloating and torsion in dogs [title] Look for dry-vomiting. [step] One of the more common symptoms of bloating and torsion, when your dog's stomach turn or twist up to 360 degrees, is an attempt to vomit with no results. This can often sound and look like a dry-heave or sound more like a deep repeated cough. 
[substeps] Vomiting with no results might also produce mucus or foam. Unless your dog is vomiting up more solid food they may be bloated or distended.