I would not consider not using a preventative for heartworm , parasites, fleas and ticks. My understanding is that treating heartworm once contracted is very difficult and very hard on your pet. A vet should not be prescribing a heartworm preventative without testing your pet yearly for heartworm. The test used should also test for Lyme and other tick diseases. After much trial and error we have settled on Sentinel and Frontline Plus for our dog. We space the 2 products 2 weeks apart.. Each pet owner has to decide what is best for there pet.
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