Stay on top of it to prevent testing
Typically, so long as your pet has been tested for heart worm in the last six months, the test came back negative, and you’ve stayed on top of the monthly preventative, your vet will give you a new prescription, without coming in for the test. But if you’ve missed dosages, your vet will require a new heart worm test before giving a new preventative prescription. And you have to see a vet in person for that. That is why it’s so important to keep up with the medication now. You don’t want to have to go into the vet’s office to get a new heart worm test right now.