Pneumonia in Sheep: Causes, Signs, Treatment and Prevention
- See your vet immediately if a sheep has labored breathing, open-mouth breathing, blue or gray gums, collapse, or stops nursing or eating.
- Sheep pneumonia is inflammation and infection of the lungs. It is often linked to bacteria such as Mannheimia haemolytica and Pasteurella multocida, sometimes after stress, transport, weather swings, crowding, or a viral or mycoplasma infection.
- Common signs include fever, cough, nasal discharge, faster breathing, depression, poor appetite, and lagging behind the flock. Lambs may decline quickly.
- Early treatment matters. Your vet may recommend antibiotics, anti-inflammatory medication, fluids, nursing care, and in severe cases oxygen or hospitalization.
- Typical 2025-2026 US cost range: about $75-$250 for a farm-call exam and basic treatment plan for one uncomplicated case, $250-$700 with diagnostics and injectable medications, and $800-$2,500+ for intensive or hospital-level care.
What Is Pneumonia in Sheep?
Pneumonia in sheep means the lungs are inflamed and not exchanging oxygen normally. In many cases, it is an infection of the lower airways and lung tissue, but the bigger picture is often more complex. Stress, poor ventilation, sudden weather changes, transport, weaning, crowding, and concurrent disease can all make pneumonia more likely.
In lambs and growing sheep, bacterial bronchopneumonia is a common form. Organisms such as Mannheimia haemolytica, Pasteurella multocida, and sometimes Bibersteinia trehalosi are important causes. Mycoplasma ovipneumoniae may act alone or weaken the airways so other bacteria can move deeper into the lungs.
Adult sheep can also develop chronic forms of pneumonia. One example is ovine progressive pneumonia, also called maedi-visna, a lentiviral disease that causes slowly worsening breathing trouble and weight loss. Because pneumonia can be acute, chronic, infectious, or management-related, your vet will look at the whole flock picture, not only one sheep.
Symptoms of Pneumonia in Sheep
- Fast breathing or increased effort to breathe
- Open-mouth breathing, blue-gray gums, or collapse
- Fever
- Coughing
- Nasal discharge
- Depression, isolation, or lagging behind the flock
- Reduced appetite or poor nursing in lambs
- Weight loss or poor growth
See your vet immediately if breathing looks hard, noisy, or faster than normal, or if a lamb stops nursing. Sheep often hide illness until they are quite sick, so even subtle respiratory signs deserve attention.
Worry increases when signs appear after transport, weaning, a weather shift, recent mixing of groups, or a known respiratory problem in the flock. Sudden death can occur in severe bacterial pneumonia, especially in lambs, so early evaluation is important.
What Causes Pneumonia in Sheep?
Pneumonia in sheep usually develops from a mix of infectious agents and management stressors. Important bacterial causes include Mannheimia haemolytica, Pasteurella multocida, and Bibersteinia trehalosi. These bacteria may live in the upper airway without causing disease, then move into the lungs when the sheep is stressed or the airway has already been irritated.
Other contributors include Mycoplasma ovipneumoniae, viral respiratory infections, and parasites such as lungworms. In adult sheep, chronic respiratory disease can also be caused by ovine progressive pneumonia, a small ruminant lentivirus. Your vet may also consider less common causes such as aspiration, severe environmental dust or ammonia exposure, or underlying lung disease.
Common triggers include poor ventilation, damp bedding, overcrowding, transport, weaning, mixing groups, abrupt temperature swings, and inadequate colostrum or nutrition in young lambs. These factors do not always cause pneumonia by themselves, but they can lower the sheep's defenses and make infection more likely or more severe.
How Is Pneumonia in Sheep Diagnosed?
Your vet usually starts with history and a physical exam. That includes listening to the lungs, checking temperature, watching breathing effort, and asking about age group, recent stress, housing, weather, transport, and whether more than one sheep is affected. In flock medicine, those details matter a lot because pneumonia often reflects both an individual illness and a herd-level management issue.
For straightforward cases, your vet may make a working diagnosis based on signs and exam findings. When the case is severe, not improving, or affecting multiple animals, added testing can help. Options may include bloodwork, nasal or deep airway sampling for culture or PCR, ultrasound, radiographs where practical, fecal testing if lungworms are possible, and necropsy of animals that die so the flock can be protected.
Diagnosis is also about sorting out the type of pneumonia. Acute bacterial bronchopneumonia, chronic lentiviral disease, parasitic disease, and other respiratory conditions can look similar at first. Identifying the likely cause helps your vet choose the most appropriate treatment plan, isolation steps, and prevention strategy for the rest of the flock.
Treatment Options for Pneumonia in Sheep
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Farm-call or clinic exam
- Temperature check and lung auscultation
- Empiric antibiotic selected by your vet when bacterial pneumonia is likely
- Anti-inflammatory medication if appropriate
- Isolation from the flock, warmth, easy access to water, and close monitoring
Recommended Standard Treatment
- Exam plus targeted diagnostics such as bloodwork, fecal testing, or respiratory sampling when practical
- Prescription antibiotic plan based on likely pathogens and meat or milk withdrawal guidance
- Anti-inflammatory medication and supportive care
- Recheck exam to confirm breathing and appetite are improving
- Flock-level review of ventilation, stocking density, recent stressors, and isolation practices
Advanced / Critical Care
- Emergency stabilization for severe breathing distress
- Hospitalization or intensive on-farm monitoring
- Oxygen support where available
- IV or SQ fluids, assisted feeding, and repeated examinations
- Imaging, culture/PCR, and broader workup for chronic, refractory, or flock-threatening disease
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Pneumonia in Sheep
Bring these questions to your vet appointment to get the most out of your visit.
- Based on the exam, does this look more like bacterial pneumonia, chronic pneumonia, or another respiratory problem?
- Which treatment options fit this sheep's condition and our flock goals right now?
- Do you recommend diagnostics, or is it reasonable to start treatment first and monitor response?
- What signs mean this sheep needs emergency recheck or more advanced care?
- Should this sheep be isolated, and for how long?
- Are other sheep in the group at risk, and what monitoring plan do you recommend for the flock?
- Could ventilation, bedding, transport, weaning, or crowding be contributing here?
- What medication withdrawal times or handling precautions apply for this sheep?
How to Prevent Pneumonia in Sheep
Prevention starts with management. Good ventilation, dry bedding, clean air, and avoiding overcrowding are some of the most practical ways to lower pneumonia risk. Lambs also need strong early immunity, so timely colostrum intake, good nutrition, and reduced stress around weaning matter.
Try to limit major stressors when possible. Transport, abrupt weather exposure, mixing unfamiliar groups, and poor barn air quality can all set the stage for respiratory disease. Quarantine new arrivals, watch closely after moves or weaning, and separate sheep that are coughing or breathing hard until your vet advises otherwise.
Work with your vet on a flock-specific prevention plan. That may include reviewing housing airflow, parasite control, vaccination strategy where appropriate, and whether chronic diseases such as ovine progressive pneumonia should be screened for in the flock. Prevention is rarely one single step. It is usually a series of small management choices that reduce stress and help sheep keep normal lung defenses.