Correct: Heartworm infection prevention does not exist. The drugs are actually a cure. However, it does prevent a case of full blown heartworm disease. I would rather use the heartworm cure pills (if that is what you prefer to call them) to kill L3 and L4 than wait until they turn into L5's. If one wants to wait until worms are reproducing in their dog's chest, fine. I will not and I will not do that to my dogs.
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