My holistic vet shares a clinic with a more traditional vet and my dogs are in their system for reminders. I just got a note about Aeri needing heartworm prevention and this was how they phrased the part about ProHeart: Did you know there is a simple, single-dose injection that can prevent heartworm disease nonstop for six full months? That adds up to a lot of heartworm disease prevention for Aerten â€“ and peace of mind for you. ProHeartÂ® 6 (moxidectin) provides a convenient option for heartworm disease prevention. It is a unique sustained-release product that provides six months of continuous protection in a single injection. In addition, ProHeart 6 treats existing immature and adult hookworm infections (Ancylostoma caninum and Uncinaria stenocephala). Think about the convenience of not having to administer heartworm preventative every single month. Then give us a call today. We'll take care of the rest. So um they're allowed to put something back on the market after it killed dogs?! WTH??