Canine Foamy Vomit. Your dog is most likely throwing up white liquid because there's not much else in his stomach to purge. If your dog tends to vomit white or yellow foam before eating in the morning, your pooch might have acid reflux, which happens when your dog's gastrointestinal tract is irritated by stomach acid, which is more problematic when the stomach is empty.
What to do if your dog is vomiting yellow foam The presence of foam in vomit does not make your dog’s situation any more. Air is often shifted back and forth in a dog’s mouth in the moments leading up to their vomit production, leading to an occurrence of frothy foam.
