A lame sheep is one that’s limping, walking unevenly, or reluctant to bear weight on one or more legs. In most cases, the problem is in the foot rather than the leg itself. Lameness is the single most common welfare issue in sheep flocks, and it almost always signals pain that needs attention. The cause can range from a mild skin irritation between the toes to a deep infection destroying the hoof.
How to Spot Lameness Early
The most obvious sign is a limp, but lameness often starts subtly. A mildly affected sheep may simply lag behind the flock or spend more time lying down. You might notice one grazing on its knees or shifting weight from foot to foot while standing. As the problem worsens, the sheep will visibly favor a leg, hold a foot up while resting, or refuse to walk at all.
Sheep farmers and vets use a simple scoring system from 0 to 3. A score of 0 means the sheep moves normally with even weight on all four feet. A score of 1 means the gait is slightly uneven but the sheep can still keep up. A score of 2 means there’s a clear limp, with the sheep nodding its head as it steps. A score of 3 means the sheep is severely lame, barely putting weight on the affected limb or not walking at all. Any sheep scoring 1 or above needs its feet checked.
Foot Scald: The Mildest Form
The most common starting point for lameness is foot scald, also called interdigital dermatitis. This is an irritation or infection of the soft skin between the two toes. The skin looks red, swollen, and moist, sometimes with a thin white film. It’s caused by bacteria that thrive when the skin between the toes stays wet for extended periods.
Outbreaks happen most often during persistent rainy weather combined with warm temperatures, when sheep are walking across wet pastures and muddy ground day after day. Foot scald on its own is relatively mild and often resolves when conditions dry out, but it’s important because it can be the entry point for more serious infections. If you’re seeing multiple sheep limping after a stretch of wet weather, scald is the most likely culprit.
Footrot: The Most Common Serious Cause
Footrot is where things get significantly worse. It starts looking identical to scald, with inflamed skin between the toes, but a specific bacterium invades deeper and begins destroying the tissue that connects the hoof to the foot. The disease exists in two forms.
Benign footrot stays mostly confined to the interdigital skin, with only minimal separation of the adjacent horn. It’s painful and makes sheep limp, but the hoof structure stays largely intact. Virulent footrot is far more destructive. It begins as interdigital inflammation, then the infection extends into the hoof itself. You’ll first notice a slight detachment of the hoof wall where it meets the skin between the toes. As the disease progresses, the separation spreads further under the heel and sole, peeling the hoof away from the living tissue underneath. Advanced cases produce a characteristic foul smell from the decaying tissue, along with a black-grey slime rather than pus.
Footrot spreads rapidly through a flock. It affects sheep of all ages, including lambs, and can move from animal to animal through contaminated pasture. The bacteria survive in the soil for up to two weeks, so a single infected sheep can seed an outbreak across the group.
Foot Abscess: A Different Pattern
Foot abscess looks similar to footrot at first glance, since both cause severe lameness in a single foot. But the two conditions have distinct features that are worth knowing.
- Swelling: Footrot causes no visible swelling. A foot abscess produces noticeable swelling, usually spreading toward the toe, and the area feels hot to the touch.
- Discharge: Footrot produces black-grey slime with a strong putrid odor. An abscess produces greenish pus with only a slight smell.
- Location: Footrot separates the sole from underneath. An abscess typically breaks out near the coronet (the junction where the hoof meets the skin), though sometimes at the heel or toe.
- Which sheep it affects: Footrot hits sheep of all sizes and ages. Abscesses tend to appear in heavier animals like rams and pregnant ewes, often triggered by damage to the hoof from overgrown horn or hard ground.
Contagious Ovine Digital Dermatitis (CODD)
CODD is a newer concern in sheep flocks, particularly in the UK. Unlike footrot, which works its way up from between the toes, CODD typically starts at the coronet band (the top of the hoof where it meets the leg) and works downward. In severe cases, the entire hoof capsule can detach, leaving raw, exposed tissue underneath. If you pick up a sheep’s foot and see lesions starting at the top of the hoof rather than between the toes, CODD is a strong possibility, and it requires different management than footrot.
Non-Foot Causes of Lameness
While the feet account for the vast majority of lameness in sheep, it’s worth checking the whole leg if the foot looks normal. Joint infections (particularly in young lambs), muscle injuries, fractures, and nerve damage can all cause limping. White muscle disease, caused by selenium or vitamin E deficiency, affects lambs and causes stiffness and reluctance to move rather than a true limp. If the feet look healthy and the sheep is still lame, the problem is higher up.
Why Prompt Treatment Matters
Lame sheep eat less, lose condition, and produce less milk for their lambs. In breeding flocks, lame rams serve fewer ewes and lame ewes raise lighter lambs. Research from UK flocks estimates the overall cost of lameness at roughly £4 to £6 per ewe per year across a flock, which adds up quickly in larger operations. But the bigger cost is in suffering. Sheep are stoic animals, and by the time you notice a limp, the pain has typically been building for days.
The most effective approach for footrot and scald is prompt antibiotic treatment of affected individuals rather than whole-flock procedures. UK research found that flocks using prompt individual treatment had lower production losses and spent less overall, saving roughly £4.65 per ewe per year compared to flocks relying on routine foot trimming and group foot baths. Routine foot trimming, once standard practice, is now associated with higher lameness rates and higher costs. It damages the protective hoof surface and can actually spread infection.
The Five-Point Plan for Prevention
The industry-standard approach to managing flock lameness follows five steps, roughly in order of priority:
- Cull repeat offenders: Sheep that are repeatedly or severely lame despite treatment carry and spread infection. Removing them from the flock reduces the bacterial load for everyone else.
- Quarantine: Isolate lame sheep from the healthy flock to prevent spread. This also applies to any new stock brought onto the farm, which should be kept separate and checked before mixing.
- Treat promptly: Catch and treat lame sheep within three days of noticing a limp. Quick antibiotic treatment clears most cases of footrot before the infection becomes entrenched.
- Avoid spreading infection: Gathering and handling sheep in tight spaces can transfer bacteria between feet and between animals. Minimizing unnecessary handling during outbreaks helps contain the problem.
- Vaccinate: Vaccination helps build flock immunity against footrot. It’s most useful as part of the broader plan rather than a standalone fix.
Foot baths using a 10% zinc sulfate solution still have a role for treating or preventing scald, particularly during wet seasons. Research in pastured lambs showed that daily passage through a zinc sulfate foot bath reduced visible footrot within 15 days and significantly cut total cases within 30 days. But foot baths work best for mild interdigital disease. Once footrot has progressed to hoof separation, individual antibiotic treatment is more effective.
What to Check When You Find a Lame Sheep
Catch the sheep and examine all four feet, not just the one it appears to be favoring. Look between the toes first for redness, swelling, or moisture. Check the sole and heel for any separation of the horn from the underlying tissue. Feel along the coronet band for heat, swelling, or any lesions starting at the top of the hoof. Smell matters too: a strong, rotten odor points toward footrot, while a milder smell with visible pus and swelling suggests an abscess.
Note whether it’s just one sheep or several. A single lame animal could be an abscess or an injury. Multiple sheep going lame over a short period, especially in wet conditions, strongly suggests an infectious cause like scald or footrot that needs a flock-level response.