[gmcbogger38]

I know of 1 dog who still got heartworms while taking heartgard. And the owners are anal about keeping him on it on a regular basis. They said heartgard was paying for the treatment, though. You can look on Dr. Karen Becker’s website Mercola Healthy Pets and she has a map of the United States and the risk of heartworms for each area color coded on the map. It tells you which area you live in when to start and stop giving the medicine.