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Heartworms (Dirofilaria immitis) are blood-borne parasites that reside in the heart or nearby large blood vessels of infected animals. Veterinarians now strongly recommend that all cats receive year-round monthly heartworm preventives.
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Heartworm disease is a serious and potentially fatal disease. Adult heartworms may live for 5 to 7 years and produce millions of offspring called microfilaria. You can prevent your dog from getting heartworms by using a heartworm preventive.