We are offering an herbal formula to help dogs that are coughing and that is due to Heartworm infestation. Coughing is a major symptom of heartworms, along with fatigue, lack of appetite, and abdominal swelling. These heartworms have caused obstruction within the the heart which then forces the dog to continually cough. This is a very successful remedy for the coughing associated with these awful parasites. This formula offers cough relief while your dog is undergoing treatment of any sort of treatment for the the infestation of Heartworms (by the way we recommend our herbals which is called Heartworm Destroyer formula). The pathomechanism ( the way it works) is that it helps the heart to beat more forcefully so that the blood pumps more vigorously through the heart's chambers. The reason your dog coughs is that the Heartworms are obstructing the flow of blood, and the blood is being forced back up into the lungs thus causing the Heartworm cough. The herbs in this formula have the function to what Traditional Chinese medicine calls "invigorating the blood" and "dispels stagnation", and these herbs are magnificently effective at helping the heart so that your dog will stop coughing.