We want to draw attention to this extremely serious subject, large dogs are more frequently confronted with it, be careful if your dog eats very quickly and that after the meal the dog is not well and his belly starts to swell and becomes very hard is that your dog is in pain, he moans, air has accumulated in the stomach and it ended up turning on itself, compressing the arteries. There is only one thing to find an emergency vet, especially do not wait or it will be fatal.