6 heartworm myths

Heartworms are gross. Like, super gross. They’re worms transmitted through mosquito bites that invade the blood vessels surrounding your pet’s heart. Not only are they absolutely disgusting (don’t search for images online — trust us), they’re also deadly. We talk a lot about heartworms over here at Banfield and one thing we’ve noticed is that there are some misconceptions about what heartworms are and what they do. In this blog post, we’ll tackle six common heartworm myths. 

Myth #1: Heartworms are only a problem in warm climates 

False. Mosquitoes can live just about anywhere, which means heartworms can thrive just about anywhere. While heartworms are more common in hot and sticky places like the East Coast and Gulf Coast, cases of heartworm infections have been reported in all 50 states. 

Myth #2: Heartworms are a summertime issue

Also false. Just like myth #1, because heartworms travel through mosquito bites, you might think heartworms are only a hot-season issue. It’s true that heartworms are more prevalent in the spring and summer months, but your pet can contract them any time of year. Even if they do get infected during the warmer months, it takes a while to show up in testing. That’s why it’s important to check for heartworm year-round and keep your pet on yearly heartworm prevention medications (more on that below). 

Myth #3: Only dogs get heartworms

False. While heartworms in dogs are a major issue, cats can contract them too. Cats are considered an atypical host for heartworms, so the worms don’t live as long as they would in a dog. Because of that, they don’t multiply as easily, and cats usually only have one-to-three worms in their body at a time. But that said, even one worm can damage your cat’s heart and be fatal. It’s challenging to diagnose heartworm disease in cats, so the best way to avoid it is to protect your cat with year-round prevention medication. 

Myth #4: Indoor pets aren’t at risk for heartworms 

False. Since heartworms spread through mosquito bites and those pesky little bugs can get into your house, there’s still a chance your indoor pet can develop heartworm disease. It's recommended that both outdoor and indoor dogs and cats receive regular heartworm prevention medicine. 

Myth #5: Pets don’t need heartworm medication

False. No matter the age or habits of your pet or where you live, it is still recommended that your little fluffball receive regular heartworm prevention medication. As heartworms grow, they can clog arteries and block blood flow to essential organs. It’s often difficult to diagnose heartworm disease until it’s in its advanced stages. So don’t risk your dog or cat’s health — if they’re not currently on prevention medication, call your veterinarian today to get them started. 

Myth #6: Pets don’t need to be on heartworm prevention year-round

False. As described above, heartworms are a problem all year, all across the country, for both indoor and outdoor pets. Keeping them on prevention medication throughout the year is the best way to ensure they’re protected.