If a dog vomits yellow water and discharges mucus, it needs to be fasted and watered immediately to avoid increasing the burden on the gastrointestinal tract. It is recommended to send the dog to the hospital for examination first to eliminate the disease. If the situation is not serious, the dog can be given some anti-inflammatory drugs and probiotics. Generally, there are many reasons that cause dogs to vomit yellow water, such as hunger, improper diet, swallowing foreign bodies, indigestion, gastrointestinal diseases, virus infection, etc. If you need to pay attention to it, do not delay the opportunity to treat your dog.