“This is a pretty thorough wormer AND heartworm preventative. I could’ve spent a lot to work my dogs but chose to just switch to this from the heartworm preventative our vet sells. Also, our vet doesn’t carry a wormer that works on the four main types of worms. I spent months trying to eliminate worms in my dog adopted from Puerto Rico this early summer, because despite asking the vet for a thorough work eliminating med for the dog, they twice sold me meds that only cover one type of worm each. Of course, this pit my other dog at risk and everyone who came in contact with the new dog who still carried worms the vets meds did nothing to eliminate.”