[Marietta B]

http://healthypets.mercola.com/sites/healthypets/archive/2010/08/03/why-havent-pet-owners-been-told-these-facts-about-heartworm.aspx

Here is a great article on heart worms. It also has the maps I was talking about. I try to follow this and not over medicate my dog. I have her tested for heart worms every year just to be sure.