Dogs vomiting yellow water may be caused by excessive hunger, catching a cold, eating foreign objects, or viral infection. First, observe whether the dog has other symptoms. If the dog has diarrhea, is not in good spirits, or does not eat or drink , blood in the stool, etc., it is best to send it to the pet hospital for examination and treatment; if there are no other symptoms, you can feed the dog some probiotics to regulate the gastrointestinal tract, and then feed the dog some light and easy-to-digest food.