A dog that vomits white foamy mucus and is in a bad mental state may be due to phlegm produced by coughing or suffering from gastrointestinal disease. If your dog suffers from respiratory diseases and will develop listlessness, loss of appetite, cough, and white foamy sputum, it is recommended to give the dog some cough-relieving and phlegm-reducing drugs.

If worms appear in the dog's foamy mucus, it should be infected with internal parasites. In this case, worms and eggs may also appear in the dog's excrement. In this regard, the owner can feed the dog some deworming medicine, or take it to the pet hospital for a deworming treatment.

Dogs with gastrointestinal discomfort will vomit white foamy secretions. It is recommended to consult a pet doctor for treatment in time.