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Lungworm in Dogs: What You Need to Know

If you’re a dog parent like me, you know how important it is to keep our furry friends happy and healthy. But there’s one little-known threat that more pet owners should be aware of: lungworm.

It might sound scary—and truthfully, it can be—but don’t worry. In this blog, we’ll break it down in a simple, friendly way so you know exactly what to look out for and how to protect your pup. Because when it comes to your dog’s health, knowledge is one of the best things you can have in your toolkit.

What Is Lungworm?

Lungworm is a parasite (Angiostrongylus vasorum, if you want the sciencey version) that can infect dogs. Unlike the more familiar intestinal worms, lungworm sets up camp in the heart, lungs, and blood vessels, which makes it a bit more serious than your everyday tummy worm.

Once inside a dog’s body, these parasites travel through the bloodstream, causing damage to the lungs and interfering with blood clotting. This can lead to coughing, breathing problems, and—in some cases—dangerous internal bleeding.

The good news? It’s also totally preventable.

How Do Dogs Catch Lungworm?

The most common way dogs get infected is by eating infected slugs or snails. Yes, that includes:

• Snacking on a slug in the garden (ew)

• Accidentally eating grass or drinking from puddles where slugs or snails have been

• Licking toys, bowls, or surfaces that have slime trails on them

Even if your dog doesn’t go out of their way to eat slugs, it can still happen by accident—especially if they’re curious sniffers or love outdoor playtime.

To make things trickier, foxes can carry lungworm too, and they can leave behind traces that spread the parasite into your garden or local parks. So even city dogs aren’t completely safe.

What Are the Symptoms?

One of the toughest parts about lungworm is that it can be hard to spot. Some dogs may carry the infection for a while before showing any obvious signs.

Here are some common symptoms to watch out for:

• A persistent cough (especially one that doesn’t go away)

• Breathing difficulties or faster-than-normal breathing

• Tiredness or reluctance to exercise (even on favourite walks!)

• Weight loss or changes in appetite

• Bleeding issues – things like unexplained bruising, nosebleeds, bleeding gums, or blood in their urine or stool

• Shaking, weakness, or seizures in more advanced cases

Of course, many of these symptoms could point to other illnesses too, which is why it’s always best to see your vet if something doesn’t feel right. Trust your gut—you know your dog best! If they’ve been nosing around in sluggy areas, it’s best to get them checked out.

Why Is Lungworm So Dangerous?

The scary part about lungworm is how it affects your dog’s body once the parasite takes hold. Because it interferes with both lung function and blood clotting, it can lead to serious complications like:

• Internal bleeding

• Collapsing episodes

• Heart failure

• Long-term lung damage

In severe cases, lungworm can be fatal—but before you panic, here’s the good news: with early diagnosis and treatment, most dogs make a full recovery. That’s why awareness and prevention are so important.

How Is Lungworm Diagnosed and Treated?

If your vet suspects lungworm, they’ll usually run some tests, which might include:

• A stool sample to look for parasite larvae

• Blood tests to check for signs of infection or clotting problems

• X-rays or ultrasounds if lung or heart involvement is suspected

Treatment typically involves prescription antiparasitic medication that kills the worms. Your vet might also provide supportive care, especially if your dog has developed complications.

Most dogs respond really well to treatment, especially when it’s caught early. That’s why acting quickly—and not waiting it out—is key.

Can You Prevent Lungworm?

Yes, you absolutely can—and it’s easier than you might think! Prevention is all about reducing exposure and making sure your dog is protected with the right treatments.

Here’s how:

✅ Monthly Parasite Protection

Not all worming treatments protect against lungworm, so double-check with your vet. Look for a product that specifically mentions lungworm prevention and make sure to give it regularly.

✅ Slug & Snail Awareness

Keep an eye out in your garden, especially in damp weather. Slugs and snails love shady, wet spots and can show up on toys, bowls, and outdoor water sources. Don’t let your dog munch on snails, slugs, or even grass if there’s been a lot of rain or damp weather.

✅ Toy & Bowl Hygiene

If your dog’s toys or bowls live outdoors, wash them regularly and bring them in overnight. A quick rinse can go a long way in keeping parasites at bay.

✅ Know Your Area

Some regions are more prone to lungworm outbreaks, so your vet can let you know if you're in a high-risk area.

Is Lungworm Contagious?

Lungworm doesn’t spread through direct contact, like from one dog to another at the park. It needs that middle step—usually a slug or snail—to complete its life cycle.

That said, if one dog in a multi-pet household is infected, it’s wise to have the others checked and treated as a precaution.

And here’s some peace of mind: humans can’t catch lungworm from dogs, so there’s no risk to you or your family.

Final Woof

Lungworm might be a hidden danger, but with a little awareness and the right prevention, it’s one you can easily stay ahead of. Be slug-smart in the garden, and trust your instincts if something seems off with your pup. Stay alert, keep those monthly treatments going, and give your dog a big cuddle for being the goodest boy (or girl).

Because when it comes to our dogs, there’s no such thing as being too careful—and every wagging tail is worth protecting.

Got questions or your own experience with lungworm? Drop a comment—I’d love to hear your stories and help other dog parents learn along the way. 🐾💛

Disclaimer:

This blog is intended for informational purposes only and is not a substitute for professional veterinary advice. If you have any concerns about your dog’s health or suspect they may have lungworm, please consult your vet as soon as possible.

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