Nothing Heartwarming about Heartworm

Image of an old dog sleeping outside.

Heartworm is a long, string-like parasitic worm that has the scientific name Dirofilaria immitis. It earns its common name by living in the host’s heart, lungs, and blood vessels. Heartworm can cause severe lung disease, heart failure, organ damage, and death. It is transmitted only through mosquitoes to a variety of species including dogs, cats, ferrets, wolves, foxes, ferrets, sea lions, and in rare instances, humans. Heartworm can affect any breed of dog or cat.

Heartworm infects animals all over the world. Once inside an animal, a heartworm can live five to seven years, and grow up to twelve inches long. Adult heartworms look like strands of cooked spaghetti.

Mosquitoes spread heartworm to the host animal. When a mosquito bites the animal, it transmits infected larvae through the bite wound. Once inside an animal, it takes six or seven months for the larvae to mature into adult heartworms. These adult heartworms mate and the females release the offspring, called microfilariae, into the host animal’s bloodstream. Mosquitoes then ingest these microfilariae when they bite the infected animal, completing the lifecycle of heartworm.

The parasite lives inside a mosquito, and develops into infective larvae in 10 to 14 days. Microfilariae cannot become infective larvae without first passing through a mosquito. This means heartworm is spread only through mosquito bites and not by casual contact.

The presence of the parasites inside the heart and lungs causes a large degree of inflammation, and can severely interfere with blood flow. This can cause coughing, asthma -like signs, heart failure, weight loss, fluid build-up in the abdomen, or sudden death. If your pet develops heartworm, your veterinarian will do tests including chest x-rays and blood tests to determine how seriously it is affected. Treatment includes doxycycline and an injectable drug named Immiticde ? which is derived from arsenic. The treatment takes several months, and can also cause side effects.

For all these reasons, it is much better to just prevent heartworm in the first place.

Sources:

American Heartworm Society

Your First Visit is FREE

Sign up now

Office Hours

Our Regular Schedule

Monday:

9:00 am-4:00 pm

Tuesday:

9:00 am-4:00 pm

Wednesday:

9:00 am-4:00 pm

Thursday:

9:00 am-4:00 pm

Friday:

9:00 am-4:00 pm

Saturday:

Closed

Sunday:

Closed

Location

Find us on the map

Testimonials

Read What Our Clients Say

  • "Wow! Thanks to all the staff at Anderson Vet Clinic. I feel like you all truly love what you do! My kitty, Lola and I always have such a pleasant experience when we come in. Fortunately, it’s usually just for a check-up, but I would not leave Lola in anyone else’s hands but yours. Thank you for your caring commitment!"
    Maya Smith / Los Angeles, CA
  • "I have benefited tremendously from the care my pet received from Dr. Anderson."
    John Doe / San Diego, CA
  • "Fabio wasn’t eating the food I was giving him and I didn’t feel he was getting the nutrition he needed. Thanks to Dr. Anderson, he evaluated Fabio and his current diet to make some recommendations and now Fabio has gone from barely eating to finishing his meals and he looks healthier than ever. You clearly are an expert in your field...thanks so much!"
    Tara Brown / Kansas City, MO

Featured Articles

Read about interesting topics

Newsletter Signup

Sign up for more articles