Florida's mosquitoes don't take winter off. Neither should your prevention routine.
Why Florida Is High Risk
In most of the country, heartworm prevention is seasonal. In Florida — and especially in Tampa's warm, wet climate — mosquitoes are active every single month of the year. That means heartworm exposure never stops.
According to the American Heartworm Society, Florida consistently ranks among the highest-risk states in the country. Tampa's combination of heat, humidity, and standing water after rain creates ideal mosquito breeding conditions.
Prevention
Prevention is simple, cheap (typically $50–$120/year depending on the product), and nearly 100% effective when given on schedule. Most products are monthly oral chewables — some also protect against fleas, ticks, and intestinal parasites.
Common brands: Heartgard Plus, Interceptor Plus, Simparica Trio, NexGard Spectra. All require a prescription from your vet. Don't buy prevention online without a current prescription — it may be counterfeit.
Testing
Even with consistent prevention, annual heartworm testing is recommended. The test is a simple blood draw at your regular wellness visit. If you've had any gaps in prevention, test before restarting — prevention does not kill adult heartworms.
If your dog tests positive, treatment is available but intensive. Caught early, prognosis is good. Caught late, it's serious. Testing annually is worth the $30–$50 added to a wellness visit.
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FAQ
Yes. Unlike northern states where heartworm season ends in winter, Florida's mosquitoes are present and active all 12 months. Year-round prevention is not optional — it's essential in Tampa.
Heartworm is transmitted exclusively by mosquitoes. When a mosquito bites an infected animal, it picks up microscopic larvae and transfers them to the next dog it bites. One bite from an infected mosquito is enough.
Annual testing is standard — typically at the yearly wellness visit. If you've ever had a gap in prevention, test before restarting. Prevention doesn't kill existing adult worms.
Untreated heartworm causes serious damage to the heart, lungs, and arteries. Treatment is possible but expensive ($1,000–$3,000+), painful, and requires 2–3 months of strict rest. Prevention is a small fraction of that cost.
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