There's not good evidence to say that this is beneficial to a healthy adult dog. But, if your dog has neck or back pain, it can be more comfortable to eat from an elevated bowl (they don't have to bend their neck as much). Regarding the risk for gastric dilitation volvulus (GDV; stomach torsion) -- to our knowledge there are only two studies on this question with elevated bowls, and their findings conflict a bit with regards to different heights of feeding and whether the risks increase or decrease. However, in both studies, feeding from a raised feeder did not reduce the risk of stomach torsion relative to feeding from the floor. The safest option in the absence of further evidence is to advise that owners of otherwise healthy ‘at risk’ dogs feed from a feeder on the floor. This may not reduce the risk of GDV, but there is no evidence to suggest that it will increase the risk.