Why do dogs vomit yellow water

Yellow water is often a sign of gastritis and dogs with weak stomachs and a tendency to overeat are more likely to suffer from this condition. If it is mild, you can stop eating for 4-6 hours and then feed your dog smaller and more frequent meals and he may recover. If the dog is still vomiting yellow water on the second or third day, with loss of appetite or barely eating or drinking, it is recommended that he is seen by a doctor and prompt treatment is important.