Lungworm FAQ

The lungworms that infect dogs, cats, horses and livestock are adapted to those animals and are not spread to people through normal pet contact. This site is about animal lungworm only. If you have human health questions, speak to a doctor.

Many animals start to improve within days of beginning an effective course, but the full treatment often runs over several days to a couple of weeks depending on the species and parasite. Always finish the complete course your vet prescribes, even if the cough eases early.

Most infections are very treatable when caught early. However, some forms — particularly Angiostrongylus vasorum in dogs and severe husk outbreaks in cattle — can become serious or life-threatening if left untreated, so prompt veterinary care matters.

Yes. Lungworms don’t shed larvae in every sample, so a single negative test doesn’t rule them out. Vets often repeat testing over several days, use blood antigen tests for the dog lungworm, or treat on suspicion when the clinical picture fits.

Not always. Some routine products only target intestinal worms. If lungworm is a risk where you live, ask your vet specifically for a product or plan that includes lungworm cover.

No — not without veterinary direction. Some livestock formulations, especially certain macrocyclic-lactone products, can be dangerous or even fatal to dogs and cats. Use a product licensed for the species you’re treating, at the correct dose.

It uses published fenbendazole dosing guidance, scaled to your animal’s bodyweight and the product strength you select. It’s an educational estimate to orient you — not a prescription. Confirm the dose and course with your veterinarian before treating.