Dogs frothing at the mouth and not eating or feeling energetic may be caused by gastrointestinal diseases, parvovirus, canine distemper, pancreatitis, poisoning, accidental ingestion of foreign objects, etc. If the dog has convulsions, it may be poisoning; if the dog If a dog has diarrhea, blood in the stool, and vomiting, it may be a viral infection or gastrointestinal disease. The dog needs to be taken to the pet hospital for examination to confirm the cause before treatment.