Sheep Diarrhea: Causes, Scours Treatment & When to Worry
- Diarrhea in sheep is a symptom, not a diagnosis. Common causes include parasites, coccidiosis, sudden feed changes, bacterial infection, and viral or protozoal scours in young lambs.
- Young lambs can dehydrate very quickly. A bright lamb with mild loose stool may be monitored briefly, but weakness, sunken eyes, cold mouth, or poor nursing need same-day veterinary care.
- Pastured sheep often develop diarrhea from gastrointestinal worms, while crowded or poorly sanitized housing raises concern for coccidiosis and infectious outbreaks.
- Treatment usually focuses on fluids, electrolytes, correcting the underlying cause, and isolating affected animals when contagious disease is possible.
- Typical US cost range for evaluation and initial treatment is about $150-$600 for an on-farm exam with fecal testing and basic medications, and $600-$2,000+ if hospitalization, IV fluids, or intensive care are needed.
Common Causes of Sheep Diarrhea
Sheep diarrhea, often called scours, has several possible causes. In pastured sheep, gastrointestinal worms are one of the most common reasons for loose manure. In older nursing and weaned lambs, coccidiosis is another major cause, especially when animals are crowded, stressed, or kept in damp, contaminated areas. Sudden diet changes, grain overload, poor-quality feed, and other nutritional upsets can also trigger diarrhea.
In young lambs, infectious scours can be caused by organisms such as E. coli, rotavirus, coronavirus, cryptosporidia, and Salmonella. These cases are more likely when lambing areas are heavily stocked, sanitation is poor, or lambs did not get enough high-quality colostrum early in life. Some infections spread quickly through a group, so one sick lamb can become several in a short time.
Other possibilities include yersiniosis, stress-related enteritis, and less commonly systemic illness that happens to include diarrhea. Blood in the stool, straining, foul odor, fever, or multiple sheep affected at once can help your vet narrow the list. Because the same symptom can come from very different problems, a fecal exam and a good flock history are often the fastest way to choose the right treatment plan.
When to See the Vet vs. Monitor at Home
See your vet immediately if the sheep is a young lamb, has watery or frequent diarrhea, seems weak, cannot stand well, stops nursing, has sunken eyes, a dry or cold mouth, blood in the stool, fever, severe bloating, or obvious belly pain. These signs suggest dehydration, electrolyte imbalance, or a serious infectious cause. In neonatal ruminants, severe scours can progress to collapse and death in as little as 12 hours.
Same-day veterinary care is also important if several sheep are affected, if a pregnant ewe has diarrhea, if there is recent shipping or crowding stress, or if abortion is occurring in the flock. Those patterns raise concern for contagious disease such as salmonellosis and can have flock-wide consequences.
You may be able to monitor briefly at home if an adult sheep has only mildly loose stool, is still bright, eating, drinking, chewing cud, and acting normally. Even then, monitor closely for worsening manure consistency, appetite drop, weight loss, or signs of dehydration. If diarrhea lasts more than 24 hours, returns repeatedly, or the sheep is thin or bottle-jawed, contact your vet to check for parasites and other underlying causes.
What Your Vet Will Do
Your vet will start with the basics: age, diet, recent feed changes, deworming history, lambing conditions, number of animals affected, and whether the sheep is still nursing or eating. Then they will assess hydration, temperature, heart rate, gut sounds, body condition, and signs of pain or shock. In flock cases, they may also ask about stocking density, sanitation, and recent animal movement.
Diagnostic testing often includes a fecal exam to look for worm eggs, coccidia, or other parasites. University veterinary diagnostic lab fee schedules in 2025 show fecal flotation or McMaster-style counts commonly around $25-$27, with Cryptosporidium testing around $15-$36 depending on the lab. Your vet may also recommend bloodwork, culture, or necropsy if the case is severe, unusual, or affecting multiple animals.
Treatment depends on the likely cause and how sick the sheep is. Many cases need oral electrolytes or IV fluids to correct dehydration and acid-base problems first. After that, your vet may discuss targeted parasite treatment, coccidiosis treatment under veterinary guidance, anti-inflammatory support, nursing care, and isolation protocols. If the sheep is critically ill, recumbent, or not able to keep up with fluid losses, referral or hospitalization may be the safest option.
Treatment Options
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- On-farm or clinic physical exam
- Hydration assessment and temperature check
- Basic fecal testing for parasites or coccidia
- Oral electrolyte plan and nursing instructions
- Targeted first-line medication plan if your vet identifies a likely cause
- Isolation and sanitation guidance for the flock
Recommended Standard Treatment
- Complete veterinary exam with flock-history review
- Fecal testing plus additional diagnostics as needed
- Oral or injectable medications selected by your vet
- Subcutaneous or IV fluids for moderate dehydration
- Pain or anti-inflammatory support when appropriate
- Recheck plan and flock-level prevention recommendations
Advanced / Critical Care
- Emergency farm call or hospital admission
- Aggressive IV fluid therapy and electrolyte correction
- Bloodwork and expanded infectious disease testing
- Frequent reassessment of hydration, temperature, and nursing status
- Tube feeding or intensive nutritional support when needed
- Necropsy or outbreak investigation support for flock-level losses
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Sheep Diarrhea
Bring these questions to your vet appointment to get the most out of your visit.
- What causes are most likely in this sheep based on age, housing, and recent feed changes?
- Does this look more like parasites, coccidiosis, nutritional upset, or an infectious outbreak?
- Which fecal tests or other diagnostics would give us the most useful answers first?
- Is this sheep dehydrated enough to need fluids, and can that be done on the farm?
- Should this animal be isolated from the rest of the flock right now?
- What signs would mean the diarrhea is getting dangerous and I should call back immediately?
- Do other sheep in the group need monitoring, testing, or preventive treatment?
- What sanitation, feeding, and stocking changes would lower the risk of more scours cases?
Home Care & Comfort Measures
Home care should support, not replace, veterinary guidance. Keep the sheep in a clean, dry, draft-free area with easy access to water. Separate affected animals when contagious diarrhea is possible, and clean feeding equipment, bedding, and lambing areas carefully. Good hygiene matters because organisms such as coccidia, cryptosporidia, and salmonella can spread through manure-contaminated environments.
If your vet says home care is appropriate, follow the fluid and feeding plan exactly. Oral electrolytes are often used to help replace losses, but they do not treat the underlying cause by themselves. Lambs should be watched closely for nursing strength, body warmth, and alertness. Adults should be monitored for cud chewing, appetite, manure output, and signs of weakness.
Do not give over-the-counter diarrhea products, antibiotics, or dewormers at random. In sheep, the wrong medication, dose, or timing can delay the right diagnosis and may worsen resistance problems or create safety issues. Call your vet promptly if diarrhea becomes more frequent, the sheep stops eating, looks tucked up, develops blood in the stool, or does not improve within a day.