April is National Heartworm Awareness Month
What Is Heartworm Disease?
April doesn’t just bring spring blooms — it also marks National Heartworm Awareness Month.
Heartworm is a serious and potentially fatal disease caused by a parasite (Dirofilaria immitis) spread by mosquitoes. Once inside a pet’s body, the larvae grow into foot-long worms that live in the heart, lungs, and blood vessels. If untreated, it can lead to heart failure, lung disease, and even death.
Dogs Are at Higher Risk — But Cats Can Suffer Too
Dogs are the primary host for heartworms. The worms mature and reproduce inside dogs, making them more prone to long-term infections. Treatment is available, but it involves months of medication, strict rest, and follow-up care.
Cats are more resistant but not immune. Even a single worm can cause breathing problems, vomiting, or — in rare cases — sudden death. There’s currently no approved treatment for heartworms in cats, so prevention is especially critical. And yes, indoor cats are still at risk — all it takes is one mosquito bite.
According to VCA Animal Hospitals Nationwide, 1 in 100 dogs and 1 in 200 cats tested positive.
Why Prevention Matters
Many pet owners in Massachusetts think heartworm isn’t a concern because it’s more common in warmer regions — but that’s a myth. Heartworm is found in all 50 states. The Companion Animal Parasite Council’s 2024 map lets you see heartworm stats by state and county.
Treatment for dogs is expensive. According to the ASPCA, the average cost is $1,000 — and in severe cases requiring surgery, it can soar to $3,000–$6,000. For cats, prevention is the only option.
How to Protect Your Pet
💊 Give monthly heartworm prevention — all year.
Mosquitoes can appear during unexpected warm spells, even in colder months. Monthly meds keep your pet protected without gaps.
🧪 Get your pet tested annually.
Even with prevention, yearly testing helps catch any infection early and ensures treatment stays effective.
👩⚕️ Talk to your vet.
Your vet can help choose the right preventive based on your pet’s age, health, and lifestyle.
⏰ Set reminders so you never miss a dose.
Use your phone or a pet health app to stay on track with monthly prevention.
At the Heart of the Matter
Heartworm is a real threat in Massachusetts — but it’s entirely preventable. Stay consistent with monthly prevention, test yearly, and consult your vet. It’s one of the simplest and most affordable ways to protect your pet’s health and happiness.
