Lungworm Infection in Goats: Coughing, Diagnosis & Treatment

Lungworm infection in goats is a parasitic disease caused by worms that live in the bronchi, smaller airways, or lung tissue. In goats, the main parasites discussed are Dictyocaulus filaria, Muellerius capillaris, and Protostrongylus rufescens. These parasites can irritate the respiratory tract and trigger coughing, reduced stamina, slower weight gain, and poor overall thrift.

Not every infected goat looks obviously sick. Some goats carry a low parasite burden with mild or no visible signs, while others develop chronic coughing or secondary pneumonia. Merck notes that parasitic pneumonia in sheep and goats tends to affect the margins of the caudal lung lobes, and that Muellerius appears to cause more problems in goats than in sheep.

For pet parents, the tricky part is that lungworm can look like other respiratory problems. A goat with coughing may have bacterial pneumonia, viral disease, dust irritation, aspiration, or another parasite issue. That is why a veterinary exam matters. Your vet can help sort out whether lungworm is the main problem, part of a mixed parasite burden, or not the cause at all.

Goats become infected by picking up infective parasite stages from the environment while grazing. The exact life cycle depends on the species. Dictyocaulus has a direct life cycle, while Muellerius and Protostrongylus use snails or slugs as intermediate hosts before the parasite reaches the goat. That means damp pasture conditions and exposure to gastropods can increase risk.

Crowding, overgrazed pasture, and repeated use of the same contaminated areas can all raise parasite pressure. Integrated parasite management programs emphasize that overstocking and grazing too close to the ground make parasite problems worse. Young goats and animals under nutritional, weather, transport, or kidding stress may be more likely to show clinical signs.

Lungworm also does not always occur alone. A coughing goat may have lungworm plus gastrointestinal nematodes, or lungworm plus bacterial pneumonia. That overlap is one reason your vet may recommend both respiratory evaluation and broader parasite testing instead of treating based on cough alone.

Diagnosis usually begins with history and exam findings. Your vet will ask about coughing, body condition, pasture use, recent deworming, herd-level parasite issues, and whether other goats are affected. Because lungworm signs overlap with pneumonia and other respiratory disease, diagnosis should not rely on symptoms alone.

For lungworm, a Baermann fecal test is often the most useful diagnostic tool because it is designed to recover larvae from feces. Merck describes the Baermann technique as the method of choice for larval recovery, and Merck's sheep and goat respiratory guidance specifically notes that diagnosis of lungworm infection requires Baermann examination of fecal material. Routine fecal egg counts can still be helpful for evaluating other parasite burdens, but they may not be enough by themselves to confirm lungworm.

In some cases, your vet may also recommend chest imaging, bronchoscopy, herd-level fecal testing, or necropsy findings from another affected animal. Follow-up fecal testing can help assess whether treatment worked, especially when there is concern about dewormer resistance or mixed parasite infections.

Prevention focuses on integrated parasite management, not automatic deworming on a calendar. Small-ruminant parasite experts recommend monitoring animals and treating when needed rather than deworming routinely, because overuse of dewormers drives resistance. Fecal testing, body condition tracking, and herd-level observation are more useful than guessing.

Pasture management matters. Avoid overstocking, reduce overgrazing, and rotate goats away from heavily contaminated areas when possible. Keeping feed and water off the ground and away from fecal contamination can also help reduce parasite exposure. Because some lungworms rely on snails or slugs, damp environments and wet grazing areas may increase risk.

Good nutrition supports immune function and helps goats tolerate parasite exposure better. Quarantine and evaluate new arrivals before mixing them into the herd. If your farm has recurring parasite problems, ask your vet to help build a herd plan that includes targeted fecal testing, selective treatment, and follow-up checks instead of blanket deworming.