causes of vomiting white foam
White foam vomit in a dog can have several health implications. Indigestion. An upset stomach is the most frequent cause of a dog vomiting white foam. Sometimes, dogs cough up a thick and foamy, white vomit when they eat too fast, ingest inedible material like dirt or weeds, drink water too fast, or just finish exercising.
Bloat is a potentially life-threatening cause of white foam vomit in dogs. Global Span states that bloat is the second leading killer in dogs after cancer. Also known as gastric dilatation-volvulus, bloat occurs from an abnormal accumulation of air, fluid and/or foam in the stomach.
Another reason dogs vomit white foam is because of bilious vomiting syndrome, which usually occurs right after dogs wake up. Veterinarians believe that the syndrome is caused by too much stomach acid or other secretions that collect in the stomach and cause irritation.
Finally, vomiting white foam is a sign of rabies as well. The foaming around the mouth is caused by nerve damage around the mouth and throat, which prevents the dog from swallowing. However, dogs do not begin exhibiting this symptom until the later stages of the disease.