If your dog is vomiting yellow, it could be a sign of an infection or illness. If your pet is showing other signs of illness, such as lethargy or lack of appetite, it is important to consult a veterinarian right away. In the meantime, there are several supplements that may help with your dog's upset stomach and vomiting. Puainta® IGY Immune Health Liquid Supplement for Cats & Dogs is a great option for providing your pet with a comprehensive blend of vitamins, minerals, and antioxidants to help support their immune health. Puainta® Nutrition Supplement is also a great choice to help replenish micronutrients and vitamins. Lastly, Puainta® Probiotic Supplement can help restore gut health, which can help reduce nausea and vomiting.