National Heartworm Awareness Month 2027: Why April, and the Prevention Conversation That Actually Works

National Heartworm Awareness Month runs every April, backed by the American Heartworm Society (AHS). The timing isn't arbitrary - it's positioned right before mosquito season ramps up across most of the country, which is exactly when a prevention conversation does the most good and a "we'll deal with it later" conversation does the most harm.

When is it, and why April specifically

The AHS designates April as Heartworm Awareness Month each year, timed to get prevention started before mosquito activity - the sole transmission route for heartworm disease - picks up for the season. The AHS also periodically releases its heartworm incidence map during this window, using veterinary practice and shelter-submitted data to track regional prevalence trends.

The prevention-vs-treatment gap owners don't appreciate

Heartworm prevention is inexpensive, low-risk, and simple - a monthly dose. Treatment, once a dog is infected, is a multi-week staged protocol with real risk, strict activity restriction, and significantly higher cost. The disease itself, left untreated, progressively damages the heart and lungs. Full clinical detail is in our heartworm disease reference, including why the exercise restriction during treatment is non-negotiable.

Despite that gap, prevention lapses are common - usually not from owners rejecting the idea of prevention outright, but from inconsistent dosing, skipped months during winter in the belief that "it's too cold for mosquitoes," or simply forgetting.

Making the April conversation stick

Address the seasonal-skipping myth directly

Many owners in milder climates believe prevention is only needed in summer. Explicitly naming and correcting that assumption during an April visit - ideally with region-specific framing - closes one of the most common gaps in compliance.

Pair the message with parasite prevention broadly

Heartworm rarely travels alone as a client education topic - flea, tick, and intestinal parasite prevention naturally fit into the same conversation. VetStack's parasite prevention reference gives a single place to walk through the full picture rather than treating heartworm as an isolated topic.

Tie it back to the vaccine and wellness visit cadence

Owners are more likely to stay consistent with monthly prevention when it's anchored to a visit cadence they already understand. Cross-referencing VetStack's vaccine schedule reference during the same conversation reinforces that both are part of one ongoing preventive care plan, not two separate asks.

Use April specifically to catch lapsed patients

Practice management software can usually flag patients whose heartworm prevention refills have lapsed. April is a natural, low-pressure month to run that report and send a direct reminder, rather than waiting until a routine annual visit surfaces the gap months later.

Heartworm-positive diagnoses come with a lot to document - staging, treatment protocol, and the strict activity-restriction conversation with the owner. See how VetStack turns that conversation into a complete note automatically →