http://www.petsandparasites.org/dog-owners/heartworms http://www.petsandparasites.org/dog-owners/heartworms/ Heartworms: http://www.petsandparasites.org/dog-owners/heartworms/ Canine Heartworm Heartworms lodge themselves http://www.petsandparasites.org/dog-owners/heartworms/ Pets and Parasites: Heartworms