A dog vomiting yellow water in the morning may be hungry, or it may be caused by other reasons, such as improper diet, indigestion, viral infection, gastrointestinal disease, etc. You need to observe whether the dog has other abnormalities. If the dog If the dog appears to be in low spirits, loss of appetite, frequent vomiting, etc., it is best to send it to the pet hospital for examination and treatment immediately to avoid delaying the condition; if the dog has no other symptoms, it may be caused by excessive gastric acid caused by long-term hunger, and the dog needs to be treated Feed the dog some food.