Summer is a time of sunshine, outdoor fun, and family adventures—including with your furry friends. But while you’re enjoying the warm weather, there’s one serious threat pet owners can’t afford to ignore: heartworms. These parasites, transmitted through mosquito bites, can cause life-threatening damage to your dog’s heart, lungs, and bloodstream.
Heartworm disease is preventable, yet many dog owners overlook prevention—especially during the high-risk summer months when mosquitoes thrive. In this blog, we’ll explore the top-rated heartworm prevention options for dogs, how to choose the best one for your pet, and why summer is a critical time to stay protected.
Why Heartworm Prevention Is Crucial in Summer
Mosquitoes are most active during humid and warm weather, which means summer months are peak heartworm transmission season. Hotter areas are particularly vulnerable due to their year-round warmth and moisture. However, no matter where you live, summer increases your dog’s exposure risk.
A single mosquito bite from an infected insect is enough to pass microscopic heartworm larvae (called microfilariae) into your dog’s bloodstream. These larvae grow into large worms that can reach up to 12 inches in length, living in the heart and arteries, and leading to:
- Coughing and fatigue
- Difficulty breathing
- Weight loss
- Organ damage
- Heart failure
Sadly, symptoms don’t show up until the disease is advanced. That’s why preventive care is far easier and safer than treatment.
How Heartworm Prevention Works
Most heartworm preventives work by killing off larvae before they mature, stopping the disease before it starts. They are typically administered monthly and may come in:
- Chewable tablets
- Topical treatments
- Injections (every 6 or 12 months)
Many of these medications also protect against other parasites like fleas, ticks, and intestinal worms, making them a wise investment in your dog’s overall health.
Top-Rated Heartworm Preventives for Dogs
Here are some of the most trusted and veterinarian-recommended heartworm prevention options available this summer:
- Form: Monthly chewable tablet
- Protects Against: Heartworms, fleas, ticks, and intestinal parasites
- Why Pet Owners Love It: Tasty chew, all-in-one protection
- Ideal For: Active dogs who spend time outdoors
- Form: Monthly chewable
- Protects Against: Heartworms, hookworms, and roundworms
- Why It’s Popular: Trusted brand, safe for puppies as young as 6 weeks
- Ideal For: Dogs with limited flea/tick exposure
- Form: Monthly topical treatment
- Protects Against: Heartworms, fleas, ticks, ear mites, and sarcoptic mange
- Key Advantage: Great for dogs who don’t like pills
- Also Beneficial In: Warmer, humid climates
4. ProHeart 6 & 12
- Form: Injectable by a vet (6 or 12 months)
- Protects Against: Heartworms (and hookworms in ProHeart 6)
- Ideal For: Owners who want to avoid monthly dosing
- Safe For: Dogs older than 6 months
- Form: Monthly topical
- Protects Against: Heartworms, fleas, ear mites, hookworms, and roundworms
- Why It Stands Out: Covers a wide range of parasites
- Perfect For: Multi-pet households or dogs with high exposure
Choosing the Right Product for Your Dog
When selecting heartworm prevention, consider:
- Your dog’s age, breed, and weight
- Lifestyle (e.g., travel, outdoor exposure)
- Any existing health conditions or allergies
- Combination protection vs. heartworm-only
Always consult your vet before starting or switching preventives, and never skip monthly doses, especially in warmer months.
Signs of Heartworm Disease to Watch For
Even with preventive measures, it’s essential to watch for signs of possible infection:
- Persistent cough
- Reduced stamina during walks or play
- Loss of appetite
- Swollen belly (due to fluid retention)
- Unexplained fatigue
If you notice any of these symptoms, schedule a vet visit immediately. Early detection can be lifesaving.
Smart Ways to Protect Your Dog During the Summer Heat
- Use a heartworm preventive year-round, not just in summer
- Reduce mosquito exposure: Keep your yard clean, remove standing water, and avoid walks during dusk/dawn
- Stay up to date with vet check-ups and heartworm tests
- Combine preventives with flea and tick protection for complete parasite control
Final Thoughts
Heartworm disease is a silent threat that can turn deadly if left untreated. But the good news is—it’s completely preventable. With so many vet-approved heartworm medications available, keeping your dog safe is easier than ever.
As mosquito season heats up, don’t take risks. Protect your dog with the best heartworm prevention, especially during the summer months. A healthy, parasite-free pup means more tail wags, beach days, and carefree adventures.
