Symptoms of respiratory infection in dogs include coughing, sneezing, runny nose, scratching the face, low fever, difficulty breathing, reluctance to exercise, lack of energy, loss of appetite, and possible bleeding in the nose. If your dog has some of the above symptoms, you need to pay attention to whether the dog has a respiratory infection. At this time, you should send it to a pet hospital for diagnosis and timely treatment. You should also pay attention to giving the dog less greasy food. If it is a respiratory infection caused by canine distemper , it is recommended to treat it with antiviral and anti-inflammatory injections.