11/23/2025
Did You Know?
PNW Slugs Can Carry a Parasite That Sickens Dogs
If you live in the Pacific Northwest, you’ve probably seen slugs and snails everywhere — on your porch, in your grass, stuck to your dog’s water bowl, even crawling across toys left outside.
Cute? Sometimes.
Harmless? Not always.
In our region, slugs and snails can carry the larvae of Angiostrongylus (commonly called lungworm), a parasite that can infect dogs when they lick, chew, or even just mouth something a slug has been on.
This isn’t fear-mongering. It’s simply one of those PNW realities most dog owners never hear about until a vet brings it up.
How Dogs Actually Get It
Dogs don’t have to eat a slug to get lungworm. The more common exposure pathways are:
•Licking grass where a slug traveled
•Chewing on sticks or toys left outside overnight
•Drinking from puddles or standing water
•Ingesting tiny slug/snail pieces accidentally when grazing
And yes — even “toy-chewers” and young puppies who explore with their mouths are at higher risk.
What Lungworm Does
Once ingested, the larvae migrate through the body and settle in the lungs or airways. That’s when symptoms show up.
Signs to watch for:
•Persistent coughing
•Trouble breathing
•Exercise intolerance
•Lethargy
•Weight loss
•Vomiting
•Nosebleeds or bleeding issues (in severe cases)
Some dogs show no symptoms at all until it becomes serious.
Why It’s Becoming More Common in Oregon
Mild, wet winters + thriving slug/snail populations = perfect conditions for spreading this parasite.
Wildlife (especially raccoons) also play a role in maintaining it in the environment.
Rescues, rural properties, farms, and wet climates see the highest exposure — but suburban yards aren’t immune.
Prevention That Actually Works
You can’t eliminate slugs from Oregon, but you can dramatically reduce your dog’s risk:
•Bring toys and bowls inside nightly
•Avoid puddle drinking, especially on trails
•Don’t let dogs eat grass in slug-heavy areas
•Wash paws and snouts after outdoor play
•Use monthly parasite prevention
Not all preventatives cover lungworm — worth asking your vet about.)
—-
American Veterinary Medical Association (AVMA) – Parasitic Lungworm Information
Oregon State University Extension – PNW Slugs & Snails Health Risks
Companion Animal Parasite Council (CAPC) – Angiostrongylus/Lungworm Guidelines
Merck Veterinary Manual – Canine Angiostrongylosis
National Center for Biotechnology Information (NCBI) – Distribution of Angiostrongylus species in the Pacific Northwest