Dogs coughing up white sputum may be caused by respiratory infection, gastrointestinal discomfort, parvovirus, or canine distemper. If the symptoms are severe, it is best to go to the hospital for examination and timely treatment. When your dog coughs up white sputum, you also need to observe whether the dog has other symptoms, such as diarrhea, poor energy, loss of appetite, fever, etc. If the symptoms are mild, you need to pay attention to your diet and try to eat as lightly as possible to avoid going to bed. Fire causes inflammation.