According to VCA Animal Hospitals, foamy yellow vomit and diarrhea in dogs is a symptom of gastroenteritis, a common intestinal illness that is caused by bacteria, viruses, certain foods and medications. It is important for dog owners to seek medical assistance if symptoms last longer than 24 hours.
Warm Animal Hospital explains that in many cases, foamy yellow vomit and diarrhea in dogs resolves on its own within a short period of time, however, persistent symptoms can signify serious conditions such as pancreatitis, kidney disease or liver disease. Treatment for bacterial and viral gastroenteritis typically consists of rehydration with intravenous fluids, medications to stop vomiting and diarrhea, dietary changes and antibiotics.
According to WebMD, occasional vomiting in dogs is considered normal, but it is important to seek immediate veterinary assistance if vomiting is accompanied by abdominal bloating, lethargy or diarrhea, or if the vomit contains bright-red blood or dark blood that resembles coffee grounds. Continuous vomiting and diarrhea can lead to dehydration in dogs, so it is also important for dog owners to monitor their pets for signs of dehydration, especially puppies and older dogs. After a bout of vomiting and diarrhea, solid foods should be withheld for approximately 12 hours so the stomach can rest and regenerate.