Yes — mosquitoes bite dogs, cats, and other pets. In South Florida, they transmit heartworm (Dirofilaria immitis) year-round. Heartworm preventive medication is essential. Professional barrier spray on your property reduces your pet's overall mosquito exposure significantly.
Most discussions of mosquito control focus on human health — West Nile, dengue, Zika. But for South Florida pet owners, mosquitoes represent a serious and very specific threat to their animals: heartworm disease, which is transmitted exclusively by mosquitoes and is the most common serious cardiovascular disease in dogs in the United States.
Heartworm and Mosquitoes: The South Florida Reality
Heartworm (Dirofilaria immitis) is a parasitic roundworm that lives in the heart and pulmonary arteries of dogs (and occasionally cats). It is transmitted exclusively by mosquitoes: an infected mosquito bites a dog, deposits heartworm larvae (L3 stage) in the bite wound, and the larvae migrate through tissues over 6 months to reach the heart and grow into adult worms that can reach 12 inches in length.
The most common South Florida mosquito species is also the primary heartworm vector. Active year-round, biting at dusk and dawn — the exact time dogs are often outside.
Unlike northern states where cold limits heartworm season, South Florida's warm temperatures sustain heartworm larval development in mosquitoes every month of the year.
The American Heartworm Society recommends year-round prevention nationally. In South Florida, skipping preventive — even in December — puts your dog at real risk.
Treating established heartworm requires multiple injections of melarsomine over months of strict exercise restriction. Prevention costs a fraction of treatment and carries no risks of its own.
What South Florida Pet Owners Should Do
Talk to your veterinarian about heartworm prevention. Monthly oral options (Heartgard, Interceptor) or 6- and 12-month injectable options (ProHeart) are available. This is the most critical line of defense.
Reducing the mosquito population on your property means fewer transmission events — fewer bites, fewer opportunities for larvae to be deposited. Our barrier spray treatment significantly reduces adult mosquito counts on treated properties, which benefits your pets directly.
Culex species are most active at dusk and early night. If your dog goes out in the evening, try to keep it brief during peak hours, especially in summer. Aedes bites during the day in shaded areas — shade-loving dogs are also exposed during afternoon shade-seeking.
Most veterinarians test annually even with prevention. No preventive is 100% effective — and catching infection early (before adult worms develop) means much simpler treatment.
Is Our Spray Safe for Your Dog?
Yes — 15 minutes after application. Our formula:
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Frequently Asked Questions
Can dogs get sick from mosquito bites?
Yes — and the primary disease risk is heartworm (Dirofilaria immitis). Mosquitoes are the only way dogs become infected with heartworm — an infected mosquito bites your dog and deposits heartworm larvae, which develop into adult worms living in the heart and pulmonary arteries. In South Florida, heartworm preventive medication is essential for all dogs precisely because of the year-round high-density mosquito population. Beyond heartworm, some dogs develop allergic reactions to mosquito saliva — producing raised welts, swelling, and intense itching at bite sites, similar to human mosquito allergy reactions.
Can dogs get heartworm from mosquitoes in South Florida?
Yes — and the risk is higher in South Florida than in most of the United States. Year-round warm temperatures sustain the Dirofilaria immitis parasite's development inside mosquitoes throughout every month of the year. The American Heartworm Society recommends year-round preventive medication nationally, but in South Florida this is not a precaution — it's a clinical necessity. Even with preventive medication, reducing your dog's mosquito exposure through property-level barrier spray reduces the frequency of transmission attempts and the overall disease burden.
Where do mosquitoes bite dogs most often?
Mosquitoes target dogs on areas with thinner or no fur covering: the nose, ears (particularly the inner ear flap), around the eyes, the belly, and the groin area. Short-haired breeds have more exposed skin and may receive more bites across the body. Dogs who spend time outdoors at dusk — when Culex species are most active — or in shaded areas during the day (Aedes) receive more bites overall. Dogs with heartworm preventive medication are still bitten; the medication prevents the larvae from developing into adult worms, not the bite itself.
Is professional mosquito spray safe for dogs?
Pets should stay off treated areas during application and for about 15 minutes while the product dries. After that, normal outdoor activity can resume — no restrictions until the next treatment. Our MPB blend uses all-natural plant-derived ingredients (citronella, rosemary, castor oil, geraniol, peppermint) with a small amount of bifenthrin/permethrin — the same class of active ingredient used in topical flea and tick products applied directly on dogs. Dogs should not eat treated vegetation or drink from puddles on treated surfaces immediately after application.
What can I put on my dog to repel mosquitoes?
For direct application on dogs, only use products labeled specifically for dogs. Human DEET products should NEVER be applied to dogs — DEET is toxic to dogs at concentrations that are safe for humans. Dog-safe options include: (1) K9 Advantix II — contains permethrin and repels mosquitoes in addition to killing fleas and ticks. (2) Products with picaridin specifically labeled for pets. (3) Some natural options (cedarwood oil, lemon eucalyptus) have limited efficacy data for dogs. The most effective approach for South Florida dogs is a combination of heartworm preventive medication + professional mosquito barrier spray on the property + limited outdoor time during peak mosquito hours (dusk for Culex, morning shade for Aedes).
Can cats get heartworm from mosquitoes?
Yes — cats can be infected with heartworm from mosquito bites, though the infection course in cats is different and typically shorter-lived than in dogs. Cats are not the natural host for Dirofilaria immitis, so fewer larvae develop into adult worms. However, even immature larvae can cause significant respiratory inflammation in cats (Heartworm Associated Respiratory Disease, HARD). Cats cannot take the same heartworm preventives as dogs — there are cat-specific options. Any cat that spends time outdoors in South Florida should be on heartworm prevention and have reduced mosquito exposure.
Protect Your Pets and Your Family
Our all-natural MPB formula is pet-safe after 15 minutes. Reduce the mosquitoes targeting your dogs year-round. FL License JB313837.
After nearly two decades in corporate finance — including managing a $1B+ P&L at Chico's FAS — Eric Vincent earned his MBA from Rollins College and made a deliberate pivot into pest control, completing his Pest Control Technology degree at the University of Florida while building Mosquito Shield of Boca and Fort Lauderdale from the ground up. He holds five Florida state licenses including Certified Pest Control Operator (JF341961) and Public Health licensee (PH340549), and is currently partnered with Arkion Life Sciences on next-generation all-natural mosquito control research.