Heartworm disease is a serious and potentially fatal disease. It is caused by foot-long worms (heartworms) that live in the heart, lungs and associated blood vessels of affected pets.
How do pets get Heartworm Disease?
The mosquito plays an essential role in the heartworm life cycle. When a mosquito bites and takes a blood meal from an infected animal it then bites another dog or cat and transmits the disease.
What are the signs of Heartworm Disease? Signs of heartworm disease in dogs may include a mild persistent cough, reluctance to exercise, fatigue after moderate activity, decreased appetite, and weight loss. As heartworm disease progresses, dogs may develop heart failure and the appearance of a swollen belly due to excess fluid in the abdomen. In the early stages of the disease, many dogs show few symptoms or no symptoms at all. Signs of heartworm disease in cats can be very subtle or very dramatic. Symptoms may include coughing, asthma-like attacks, periodic vomiting, lack of appetite, or weight loss. Occasionally an affected cat may have difficulty walking, experience fainting or seizures, or suffer from fluid accumulation in the abdomen. Unfortunately, the first sign in some cases is sudden collapse of the cat, or sudden death.
Is Heartworm Disease Curable?Heartworm disease causes lasting damage to the heart, lungs and arteries, and can affect the dog’s health and quality of life long after the parasites are gone. For this reason, prevention is by far the best option, and treatment—when needed—should be administered as early in the course of the disease as possible. Heartworm disease in cats is very different from heartworm disease in dogs. The medication used to treat heartworm infections in dogs cannot be used in cats, so prevention is the only means of protecting cats from the effects of heartworm disease.
How can I protect my pet from Heartworm Disease?
Annual testing is necessary, even when dogs are on heartworm prevention year-round, to ensure that the prevention program is working. Heartworm medications are highly effective, but dogs can still become infected. If you miss just one dose of a monthly medication—or give it late—it can leave your dog unprotected. Even if you give the medication as recommended, your dog may spit out or vomit a heartworm pill—or rub off a topical medication. Heartworm preventives are highly effective, but not 100 percent effective. If you don’t get your dog tested, you won’t know your dog needs treatment. Heartworm infection in cats is harder to detect than in dogs, because cats are much less likely than dogs to have adult heartworms. The preferred method for screening cats includes the use of both an antigen and an antibody test (the “antibody” test detects exposure to heartworm larvae). Because there is no approved treatment for heartworm infection in cats, prevention is critical.
Heartworm preventives must be purchased from your veterinarian. A heartworm test is performed to make sure your pet doesn't already have adult heartworms, as giving preventives can lead to rare but possibly severe reactions that could be harmful or even fatal. If the heartworm testing is negative, prevention medication is prescribed.
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