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I have also begun looking for a natural way to prevent heartworms. I live in Florida, so there are always mosquitos so it is very important for Shadow (my weim) to have some sort of prevention. As of now, Shadow takes Trifectus for fleas and heartworms monthly. We have never had any problems with fleas, so I am thinking about switching him to a natural flea preventative and maybe just useing hearguard to prevent heartworms. Does anyone know of any other natural heartworm preventatives?