Canine Lungworm in Dogs: Risks, Symptoms & Prevention
As a dog owner, it’s important to be aware of canine lungworm, a parasite increasingly found in the U.S. that can be deadly without timely treatment. This article will walk you through what lungworm is, how it impacts dogs, and practical prevention strategies to help protect your furry companion.
What Is Canine Lungworm?
Canine lungworm is caused by the parasite Angiostrongylus vasorum, a worm that inhabits the blood vessels near the heart and migrates through the lungs during its lifecycle. Even though it’s called lungworm, the adult worms mainly reside in the heart’s vessels, but as larvae move through lung tissues, they can trigger coughing and breathing issues.
The parasite’s lifecycle starts when eggs hatch into larvae, which dogs expel through coughing, then swallow and pass in their stools. These larvae mature inside slugs and snails, serving as intermediate hosts. Dogs contract the infection by eating these mollusks, licking surfaces contaminated with slug or snail slime, or consuming other animals that have eaten infected slugs or snails. The entire cycle from ingestion to mature worms in the heart’s vessels spans approximately four weeks.
Is Lungworm a Threat to My Dog?
Lungworm cases in the U.S. are on the rise, spreading beyond traditionally wetter, milder climates to various regions including the Pacific Northwest and parts of the Northeast. Young dogs under two years and those that accidentally consume slugs, snails, or contaminated items outdoors face elevated risk levels.
Dogs with unrestricted outdoor access, especially those that roam off-leash in moist environments where slugs and snails proliferate, are more susceptible. Puppies and young dogs’ curious behavior often leads them to ingest infective larvae unintentionally.
What Symptoms Can Indicate Lungworm Infection?
Lungworm symptoms may be subtle and non-specific, complicating diagnosis. Typical signs include coughing, labored or rapid breathing, fatigue, and unusual bleeding due to clotting abnormalities. In severe instances, dogs may develop abdominal fluid accumulation, seizures, or sudden collapse.
It’s critical to contact your veterinarian promptly if your dog shows respiratory issues or any unexplained bleeding. Early diagnosis significantly improves treatment success rates.
How Do Veterinarians Diagnose Lungworm?
Diagnosing lungworm infection usually involves multiple approaches: repeated stool examinations to detect larvae, chest radiography, blood tests, and occasionally bronchoscopy for direct airway visualization. New rapid blood assays can identify lungworm infection with over 98% accuracy within 15 minutes using small blood samples, although they primarily detect common lungworm species.
What Treatment Options Are Available?
Treatment depends on veterinarian-prescribed antiparasitic medications like milbemycin oxime or moxidectin, often given monthly to combat the parasite effectively. In more serious cases, hospitalization might be necessary for oxygen therapy, corticosteroids, antibiotics, or blood transfusions. Prompt intervention significantly improves outcomes.
How Can I Prevent Lungworm in My Dog?
- Administer monthly preventive medications: Use approved veterinary worming products containing milbemycin or moxidectin every 30 days to effectively shield your dog.
- Reduce exposure to slugs and snails: Store your dog’s toys indoors and clean outdoor water bowls frequently to limit contact with infected slime.
- Clean up feces promptly: Removing dog waste interrupts the lungworm lifecycle by minimizing environmental larvae.
- Avoid wet, slug-friendly areas: Steer clear of damp yards, gardens, or wooded areas known for high slug and snail populations, especially in regions with rising lungworm cases like the Pacific Northwest.
- Schedule regular check-ups with your veterinarian: Talk about lungworm risk during routine visits and consider screening if your dog’s lifestyle poses higher exposure.
- Stay updated on local lungworm outbreaks: Awareness of regional lungworm trends helps you adapt preventive care during peak seasons.
If you suspect your dog may be at risk or displays symptoms, contact your veterinarian immediately for evaluation and testing. With consistent prevention, you can safeguard your pet against this serious yet treatable disease.
For those planning to welcome a new dog, always seek reputable breeders or consider adoption through responsible U.S. shelters and rescue organizations to give your new companion the healthiest possible start.
