Enterotoxemia in Sheep: Pulpy Kidney Disease and Sudden Death in Lambs
- See your vet immediately. Enterotoxemia is a rapidly fatal clostridial disease, most often linked to Clostridium perfringens type D in fast-growing lambs on heavy milk, grain, or lush pasture.
- Many lambs are found dead with little warning. Others may show sudden depression, staggering, blindness, teeth grinding, convulsions, or diarrhea before death.
- Diagnosis often relies on flock history, recent diet change, sudden death pattern, and necropsy with intestinal content testing for clostridial toxins.
- Treatment can be attempted in early cases with antitoxin, fluids, anti-inflammatory care, and nursing support, but prognosis is guarded once neurologic signs are severe.
- Prevention is the most effective strategy: vaccinate ewes before lambing, vaccinate lambs on schedule, and make feed changes gradually.
What Is Enterotoxemia in Sheep?
Enterotoxemia is a severe toxemia caused by toxins produced in the intestine by Clostridium perfringens, most commonly type D in sheep. You may also hear it called pulpy kidney disease or overeating disease. It is seen worldwide and is especially common in rapidly growing lambs that are consuming rich milk, grain, or lush pasture.
The disease develops when clostridial bacteria multiply quickly in the gut and release toxin, especially after a sudden increase in highly digestible carbohydrates. That toxin can damage the intestines, blood vessels, kidneys, brain, and other organs. In many cases, the first sign is sudden death in a lamb that looked healthy earlier the same day.
The name "pulpy kidney" can be misleading. Some affected lambs do have rapid kidney breakdown after death, but that finding is not always present. Because the disease can move so fast, prevention through vaccination and careful feeding management is usually far more effective than trying to treat a lamb after signs begin.
Symptoms of Enterotoxemia in Sheep
- Sudden death with no warning signs
- Found dead after appearing healthy and fast-growing
- Severe depression or separation from the flock
- Staggering, incoordination, or weakness
- Blindness or apparent disorientation
- Teeth grinding or signs of abdominal pain
- Convulsions, paddling, or seizures
- Head pressing or neurologic behavior changes
- Recumbency and inability to rise
- Diarrhea may occur, but is less consistent in sheep than in goats
When signs appear, this is an emergency. Many sheep with enterotoxemia deteriorate within hours, and some die before treatment can begin. Neurologic signs such as seizures, blindness, or collapse suggest advanced toxin effects and carry a poor prognosis.
Call your vet right away if a lamb dies suddenly after a feed change, grain access, heavy milk intake, or turnout onto lush pasture. If more than one animal is affected, your vet may recommend urgent flock-level prevention steps for exposed sheep.
What Causes Enterotoxemia in Sheep?
Enterotoxemia usually happens when Clostridium perfringens type D multiplies rapidly in the intestine and produces epsilon toxin. The organism is common in the environment and can be present in the gut without causing disease. Trouble starts when feeding conditions allow it to overgrow.
Common triggers include sudden access to grain, high-carbohydrate creep feed, overeating after a ration change, heavy milk intake in young lambs, and turnout onto lush, rapidly growing pasture. Fast-growing, well-conditioned lambs are often at highest risk. In very young lambs, singles may be affected more often than twins because they may consume more milk.
Not every case follows a dramatic feeding mistake. Sometimes the shift is subtle, such as richer pasture, inconsistent bunk space, or a lamb breaking into feed. Lack of vaccination or incomplete vaccine timing also increases risk. Your vet can help sort out whether the problem is mainly nutritional, infectious, or both.
How Is Enterotoxemia in Sheep Diagnosed?
Diagnosis is often based on a combination of history, clinical pattern, and postmortem findings. Your vet will ask about age, growth rate, vaccination status, recent feed changes, grain access, and whether affected lambs were among the best-doing animals in the group. That pattern can be very suggestive.
Because many lambs die quickly, necropsy is often the most useful next step. Findings may include excess feed in the digestive tract, fluid around the heart, intestinal changes, pulmonary edema, and sometimes the classic soft or "pulpy" kidneys. However, those lesions are not always present, especially in young lambs.
Definitive confirmation can be challenging because clostridial bacteria overgrow rapidly after death. Your vet or diagnostic lab may collect intestinal contents as soon as possible for toxin testing, such as assays that detect epsilon toxin. Fast sample collection matters. Other causes of sudden death, including pneumonia, bloat, polioencephalomalacia, toxicities, and other clostridial diseases, may need to be ruled out.
Treatment Options for Enterotoxemia in Sheep
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Urgent farm call or herd consultation when available
- Physical exam of affected sheep and review of recent feed changes
- Immediate removal of grain or rapid ration correction
- Clostridial antitoxin if your vet advises it and it is available
- Basic supportive care such as oral fluids, warmth, and quiet nursing for mildly affected animals
- Emergency vaccination planning for exposed flockmates if appropriate
Recommended Standard Treatment
- Farm exam or clinic evaluation
- Injectable clostridial antitoxin when indicated
- Anti-inflammatory medication and pain control selected by your vet
- IV or SQ fluids depending on severity and setting
- Sample collection or necropsy submission for confirmation
- Targeted flock recommendations for vaccination timing and feed transition
Advanced / Critical Care
- Emergency referral or intensive on-farm critical care when available
- IV catheter placement and repeated fluid therapy
- Frequent neurologic monitoring and nursing care
- Advanced diagnostics, bloodwork, and full necropsy/lab submission for herd investigation
- Aggressive treatment of complications such as seizures, shock, or severe dehydration as directed by your vet
- Detailed flock health plan covering vaccination, nutrition, and outbreak prevention
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Enterotoxemia in Sheep
Bring these questions to your vet appointment to get the most out of your visit.
- Does this look most consistent with enterotoxemia, or should we also consider bloat, pneumonia, polio, or another cause of sudden death?
- Should we submit this lamb for necropsy or collect intestinal samples now before postmortem changes make diagnosis harder?
- Would clostridial antitoxin still be useful for this sheep or for exposed flockmates?
- What feeding change may have triggered this, and how should we transition grain or pasture more safely?
- What CDT or clostridial vaccine schedule do you recommend for our ewes, lambs, and replacement stock?
- If the ewe was vaccinated before lambing, when should the lambs start their own vaccine series?
- Which animals in the flock are at highest risk right now, and what should we do today to reduce more losses?
- What warning signs mean a lamb still has a realistic chance with treatment versus needing a different plan?
How to Prevent Enterotoxemia in Sheep
Prevention centers on vaccination and careful feeding management. Most flocks use a clostridial vaccine program that includes protection against C. perfringens types C and D plus tetanus. Ewes are commonly boosted in late pregnancy so they pass antibodies to lambs through colostrum. Lambs then need their own vaccine series on the schedule your vet recommends.
Feed changes should be gradual, especially when introducing grain, creep feed, or lush pasture. Avoid sudden access to large amounts of concentrate. Make sure timid lambs are not being pushed into feast-and-famine eating patterns by competition at the feeder. Consistent ration delivery and good bunk management matter.
If you lose a lamb suddenly, do not wait for a second or third death before calling your vet. Early flock review can help identify whether vaccine timing, colostrum transfer, feed formulation, or pasture management needs to change. In many outbreaks, the most effective treatment is preventing the next case.