Sheep Hypothermia or Cold Stress: Signs, Lamb Emergencies & What to Do

Cold stress in sheep usually happens when heat loss is greater than the animal can replace. In lambs, the biggest risk factors are being born into cold, wet, or windy conditions, not drying off well after birth, and failing to nurse quickly enough. Newborn lambs have limited energy reserves, so a delay in colostrum intake can turn a chilly lamb into a true emergency fast.

A common pattern is the starvation-hypothermia cycle. A lamb that is weak, mismothered, one of a multiple birth, or born to a ewe with poor milk supply may not get enough colostrum. Without that early energy, the lamb cannot maintain body temperature. As body temperature drops, the suckle reflex weakens even more, making nursing less likely.

In older lambs and adult sheep, cold stress is more often linked to weather exposure plus another problem. Heavy rain, sleet, mud, wind, recent shearing, poor body condition, illness, lameness, or being unable to reach feed and shelter can all contribute. Adult sheep tolerate cold better than newborns, but wet fleece and wind can sharply increase heat loss.

Your vet will also think about underlying disease. Pneumonia, diarrhea, watery mouth in lambs, weakness from difficult birth, and low blood sugar can all make a sheep colder and less able to recover. That is why a cold sheep is not always dealing with weather alone.

See your vet immediately if the sheep is down, limp, not nursing, has a weak or absent suckle reflex, feels cold in the mouth, cannot stand, is breathing poorly, or has a rectal temperature below 37°C (98.6°F). In newborn lambs, severe hypothermia can progress quickly to collapse and death. A lamb that is more than a few hours old and severely cold may also be dangerously low on glucose, which changes how warming should be handled.

Urgent same-day veterinary care is also wise for lambs that are weak but still responsive, lambs from difficult births, twins or triplets that are not competing well, and any sheep with cold stress plus diarrhea, coughing, abdominal distension, or signs the ewe is not producing enough milk. If you are not sure how old the lamb is, whether it has nursed, or how to take a rectal temperature safely, call your vet early.

Home monitoring may be reasonable only for a bright, standing sheep with mild chilling, normal nursing behavior, and quick improvement after drying, shelter, and warming. Even then, watch closely for relapse over the next several hours. A lamb that looks better briefly but still does not nurse well can slide back into trouble.

While waiting for help, move the sheep out of wind and wet conditions, dry the coat if needed, provide deep dry bedding, and warm the body gradually. Avoid force-feeding a lamb that cannot swallow well. If the lamb is weak, cold, or has a poor suckle reflex, your vet should guide the next step.

Your vet will first assess temperature, age, hydration, heart and breathing rate, mental status, and whether the lamb has a suckle reflex. In newborns, those details matter because treatment differs between a mildly chilled lamb that can still swallow and a severely hypothermic lamb that has likely run out of energy reserves. Your vet may also check whether the ewe has milk, whether bonding is intact, and whether there are signs of difficult birth, infection, or trauma.

Treatment often starts with controlled rewarming and energy support. That may include drying, warm air or warming boxes, warm bedding, and colostrum by bottle or stomach tube if the lamb is warm enough and able to handle it. In more serious cases, your vet may give warmed glucose or other fluids, especially if the lamb is older than a few hours and severely cold. Oxygen, anti-inflammatory care, and treatment for pneumonia, watery mouth, diarrhea, or sepsis may also be needed depending on the exam.

For adult sheep, your vet may focus on shelter, rewarming, fluids, and treating the reason the sheep became cold in the first place. That could mean addressing pneumonia, parasitism, poor body condition, recent shearing stress, or inability to access feed and water. Bloodwork is not always necessary, but it can help in weak or nonresponsive cases.

After stabilization, your vet will help with a practical flock plan. That may include lambing pen setup, wind protection, colostrum management, monitoring small or multiple-birth lambs, and deciding when a lamb can safely return to the ewe versus needing supplemental feeding or hospital-style care.

If your sheep is cold, the first priorities are dry, warm, sheltered, and observed. Move the animal out of wind, rain, snow, or mud. Dry wet lambs thoroughly with towels, then provide deep dry bedding and a draft-free pen. Warm the body gradually with safe heat sources such as a warming box, warm room, or wrapped warm water bottles. Keep heat gentle and even to avoid burns or overheating.

For newborn lambs, nursing status matters as much as temperature. A lamb that is bright and able to suck may need prompt colostrum support and close observation with the ewe. A lamb that is weak, cold-mouthed, or not swallowing well should not be force-fed by mouth without veterinary guidance because aspiration is a real risk. If you have been shown how to use a stomach tube safely, follow your vet’s instructions exactly.

Check the ewe too. Make sure she is attentive, allows nursing, and has milk available. Small lambs, twins, and triplets often need extra monitoring in the first day. Recheck temperature, activity, and nursing frequently. A lamb that warms up but still stands hunched, cries, wanders, or fails to fill its belly needs more help.

Prevention is part of home care. During lambing season, keep pens clean and dry, reduce drafts while maintaining ventilation, provide shelter from wind and wet weather, and watch high-risk lambs closely in the first 8 to 12 hours. Early colostrum intake and fast response to weakness are two of the most effective ways to reduce losses from cold stress.