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Dog Health: What You Need to Know About Heartworm Prevention

dog training to build a strong bond and better behavior.

Last Updated: August 2025

Last updated: August 2026

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If you own a dog, it’s likely that you know a thing or two about heartworms.

In fact, every time you take your dog into the vet for a yearly check up, you probably see posters plastered all over the office about heartworm medications and prevention.

Why is this such a big deal? Easy…

Over 250,000 dogs get diagnosed with heartworms every year. And when left untreated, these parasites cause pup’s to suffer from a long, agonizing death.

I don’t mean to sound so grim. But, I also believe the health and wellbeing of your dog is so important, that I wouldn’t be doing this post justice if we didn’t dive into the devastating reality of what happens when people neglect to properly medicate their dog’s against an issue that is 100% preventable.

Hi, I'm Doggy Dan… so what are heartworms, how do you prevent them, and what’s the outlook look like for a dog who is diagnosed with heartworms? Keep reading to find out everything you need to know…

What Are Heartworms?

Just like the name suggests, heartworms are a type of parasitic roundworm.

Dog’s are natural hosts to these worms, which live in the heart and lungs of canines. These worms can grow up to a footlong.

Overtime, heartworms reproduce causing blockages in your dog’s heart valves using your pup's body as a home to feed, breed, thrive.

How Do Dogs Get Heartworms?

Heartworms are spread through mosquito bites, making it impossible to keep your dog 100% safe from contracting them…even if your dog spends most of his/her time inside.

All it takes is one bite from a mosquito that is a host to heartworm larvae for your dog to become infected.

Dog’s who live near bodies of water are more prone to contracting heartworm disease. However, there’s really nowhere in the world that is immune to mosquitos, making getting bitten a risk for all dog’s around the world.

Regions of the World Where Heartworms are Most Commonly Found

Heartworms are a living organism. Therefore there are parts of the world where they tend to thrive, and other parts of the world where they are not as big of a problem.

For the most part, heartworm disease is most prevalent in tropical and temperate regions of the world. Its highest known prevalence is in the USA, South America, Japan, Australia and Italy.

If you are living in the USA, heartworm disease is most common along the Atlantic and Gulf coasts from the Gulf of Mexico to New Jersey and along the Mississippi River and its major tributaries.

This being said, heartworms can be found all over the world which means–unless you live somewhere like Antarctica–your dog is at risk and it’s probably a good idea to take preventative measures to ensure your dog doesn’t get infected!

The Best Method for Heartworm Prevention

Heartworm disease is a painful, devastating, and sometimes fatal diagnosis for dogs. But here’s the good news…

Heartworms are 100% preventable.

The even better news…

It is both easy AND inexpensive to ensure your dog gets the treatment they need to stay healthy.

The best way to ensure your dog never ends up with heartworms is to give him/her a heartworm prevention pill every month (some brands offer pills that last 3 months at a time!).

Your vet can prescribe your pup a pill, or you can find heartworm prevention medication at your local pet store.

It typically doesn’t cost more than $30-$80 US dollars every few months (depending on the size of your dog) to keep your pup protected, so it’s very affordable.

If you’re struggling financially, please let your vet know. It’s possible that you might qualify for payment plans or product discounts as many vets would prefer to see dog’s protected instead of coming into the office with heartworm disease.

Heartwork Diagnoses Outlook: Is There Hope for Your Dog?

What happens if you…

  • Weren’t aware of heartworm disease/never medicated your dog?
  • Rescue a dog with heartworm?
  • Find out our pup has heartworm, regardless of using medication (HIGHLY unlikely!)?

We’ve mentioned a few times that heartworm disease is a devastating sometimes fatal diagnosis. While this is true, we don’t want you to lose hope.

When heartworm is caught in the early stages, it’s very possible for your pup to make a full recovery. In fact, people who work in shelter’s often bring in dog’s who test positive for heartworm, and many end up going on to live happy, healthy lives once treated.

Your vet can work with you to put together a treatment plan for your dog. However, please understand that treating heartworm is a very long, and costly process.

General treatment is often around $1,000 US dollars. And that doesn’t account for overnight vet care or anything else your dog might need depending on the stage of heartworm disease he/she is facing.

If the heartworm disease has progressed too far and your dog is suffering, your vet might discuss end of life care and putting your dog to rest. While this isn’t an easy decision, it’s your job as a responsible dog owner to make the best decision on behalf of your dog who is suffering.

Investing In Your Dog’s Health

A small investment in your dog’s health today can save you from a lot of expenses and having to make difficult decisions in the future.

Above all, your dog deserves a healthy, happy life. I promise, making the decision to purchase heartworm medication over special toys and treats is the best gift you can give your dog!

And don’t forget…

The same philosophy applies to dog training! Making an investment in your dog’s training now will help ensure that your dog lives a safe, happy, and stress-free life.

If you’re struggling with dog training or simply haven’t found a program that works for you, I invite you to check out my program, The Dog Calming Code.

Learn more about The Dog Calming Code here!

Cheers,

Doggy Dan Signature
~Doggy Dan 🙂

Gentle journey for your puppy.

Doggy Dan

Doggy Dan stands out through his “five golden rules” that focus on canine psychology rather than repetitive drills or force. Unlike traditional trainers, he teaches owners to become the “calm leader” their dogs need. Over the last two decades, his methods have helped transform over 136,934 dogs worldwide. As the founder of TheOnlineDogTrainer.com blog and podcast and creator of the Dog Calming Code™, he has become a trusted voice in dog psychology and training. His philosophy is simple: reactive dogs don’t need punishment or endless treats. They need a leader they can trust.

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For three years, I tried every treat-based method and expensive course to stop my large, powerful male dog from pulling on the leash, barking, and stressing out when his energy got too high on our walks. (So while he is a farm dog who enjoys total freedom off-leash on our farm most of the day, on-leash in the city, he totally lost it). He was practically hanging from the leash, two feet in the air (almost strangling himself), always demanding to walk in front and make all the decisions. Absolutely nothing worked—until I found Doggy Dan! 🏆 After just a couple of weeks implementing The 5 Golden Rules, the transformation is absolutely mind-blowing!!! By focusing on connection and calm leadership rather than rigid commands, my dog has FINALLY reconnected with his natural calmness (that has actually always been there inside him) ❤️❤️ When we walk through town now, I look down at my dog walking in a perfect "heel." The leash hangs completely loose, and that loose leash really says it all 👍👍👍 He does not pull, bark, or growl AT ALL when other dogs bark at him!😱 Yes, he looks at them and is interested, but he remains completely calm. We pass shouting people, groups of kids on scooters, and dogs barking aggressively behind gates—he is interested, but he remains entirely unfazed. Just yesterday, we stopped in front of a fence with chickens walking in a garden, and he just stood there watching curiously, staying completely still. And as we walked across a large, grassy schoolyard, we suddenly crossed paths with two rabbits—when I told him to, he immediately sat down. Of course, he was highly interested, but he sat completely, utterly still! I constantly find myself thinking: This can NOT be my dog, LOL! 🐇🐓 Dan refers to himself as a dog trainer, but in my humble opinion he is a dog philosopher. The course is incredibly generous, filled with hundreds of real-life videos from every situation imaginable, offering a massive toolkit for an amazing price. I am so excited to continue this course, so happy about the progress, and so looking forward to the future with this beloved dog of mine. I HIGHLY recommend it! ⭐⭐⭐⭐⭐
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We have adopted a Poodle and he us very high energy, anxious and insecure. I joined the online program after I watched the free online webinar about the 5 Golden Rules. While watching the webinar all 3 of my dogs ran off barking... I calmly called out "thank you" and they all came back to me.. from that moment I was hooked. I love the fact that we use minimal sound in this technique as I can become anxious and unsure in my tone. I have seen results with the new Poodle and I am exited about our future. Thanks Doggy Dan, you are a gem 👌🐾🐾🐾
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FREE webinar:

How to Solve Dog Reactivity WITHOUT Food Bribes, Tricks, or Force

dog training to stop unwanted jumping and barking

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