Fast eaters can raise their risk of getting bloat, a very serious condition that can quickly lead to death if not treated. Even if your dog is at lower risk of bloat, fast eaters sometimes will vomit their just-eaten meal which is also not healthy. And let's face it, it's gross!
We can reduce the potential for bloat by slowing down their eating with the use of a slow feeder bowl. We have the one below and while our dogs are not fast eaters, we often use them with boarding dogs. There are others out there as well, but we find this one easiest to clean.
In addition to this, always give your dogs one full hour after eating before letting them play and run around. For high risk breeds like Great Danes, give them two hours.