A dog vomiting a lot of water may be caused by drinking water too quickly, ingesting foreign objects, food poisoning, gastrointestinal diseases, etc. You should observe the dog's mental state. If there is diarrhea, poor energy, loss of appetite, etc. The situation requires timely delivery to the hospital for examination and treatment. Pay attention to your dog's diet and do not feed your dog random food, especially chicken bones, to avoid scratching the stomach.