Foot Rot in Sheep: Causes, Lameness Signs, and Treatment

Foot rot is a contagious bacterial disease of the feet that affects sheep welfare and flock productivity. It usually starts in the skin between the claws, then can progress to separation of the hoof horn from the sensitive tissue underneath. As the disease worsens, sheep may limp, spend more time lying down, lose body condition, and graze less.

The key organism is Dichelobacter nodosus. In many cases, Fusobacterium necrophorum also plays a role by damaging moist interdigital skin and helping infection take hold. Warm, wet, muddy conditions make spread much easier, which is why outbreaks often flare during rainy seasons or in heavily trafficked areas.

Foot rot is different from simple overgrowth or a minor hoof irritation. Early disease can resemble foot scald, which causes inflammation between the toes. More advanced foot rot causes undermining of the horn, a characteristic bad smell, and chronic hoof deformity if it is not addressed. Because infected sheep can act as carriers, one lame animal can become a flock problem over time.

This is not something to ignore and hope will pass. If a sheep is lame, losing condition, or has obvious hoof separation, involve your vet early so treatment matches the severity of the case and the needs of your flock.

Foot rot develops when the right bacteria meet the right environment. Dichelobacter nodosus is the primary infectious cause. It invades softened, damaged skin at the hoof-skin junction. Fusobacterium necrophorum, a bacteria commonly found in manure-contaminated environments, can contribute by causing interdigital dermatitis and creating conditions that let foot rot establish.

Wet pasture, muddy lots, poor drainage, and heavy manure contamination all increase risk. The bacteria spread most readily when feet stay moist and the skin between the claws becomes macerated. Crowding around feeders, waterers, and gates can make this worse because sheep repeatedly stand in the same damp, contaminated areas.

Hoof shape and management also matter. Overgrown or misshapen feet can trap mud and manure, while cracks and pockets in the horn can shelter bacteria. Introducing new sheep without quarantine is another major risk because apparently normal animals may carry infection in hoof defects or old lesions.

Not every lame sheep has foot rot. Your vet may also consider foot scald, hoof abscess, injury, laminitis, arthritis, contagious ovine digital dermatitis, or foreign body trauma. That is one reason a hands-on hoof exam is so important before choosing treatment.

Diagnosis usually starts with history and a careful foot exam. Your vet will look at how many sheep are lame, recent weather, pasture conditions, and whether new animals were added to the flock. On the foot itself, they look for interdigital inflammation, odor, horn separation, heel or sole involvement, and chronic hoof distortion.

In many cases, foot rot is diagnosed clinically. That means your vet uses the pattern of lameness and the appearance of the feet rather than relying on a single lab test. Early disease may look like foot scald, while advanced disease shows more obvious undermining of the horn. Because several hoof problems can look similar from a distance, lifting and cleaning the foot is essential.

Some cases need more investigation. If the diagnosis is unclear, your vet may discuss swabs, flock scoring, or evaluation for other causes of lameness. They may also assess whether the problem is limited to a few sheep or is established in the flock, since that changes the management plan.

A good diagnosis does more than name the disease. It helps your vet decide whether conservative care, standard treatment, or more aggressive flock control steps make the most sense for your goals, labor, and budget.

Prevention starts with biosecurity. New sheep should be quarantined, their feet examined carefully, and any suspicious lesions addressed before they mix with the flock. Because carrier animals can look normal between flare-ups, asking about flock history before purchase is also worthwhile.

Dry footing matters more than many pet parents realize. Improve drainage around feeders, waterers, gates, and shelters. Rotate away from muddy areas when possible, and keep bedding clean and dry. Merck also notes that paddock and shelter surfaces should be kept as dry as possible to reduce foot disease risk.

Routine hoof observation helps catch problems early, but trimming should be thoughtful rather than aggressive. Over-trimming can damage healthy tissue and create more entry points for bacteria. Your vet can help you decide how often feet should be checked in your setup and whether a preventive footbath program makes sense during high-risk weather.

For flocks with repeated problems, prevention may need a bigger plan. That can include isolating lame sheep quickly, removing chronic carriers, tightening purchase protocols, and discussing vaccination if it is available and appropriate in your area. The best prevention program is the one your vet can tailor to your climate, facilities, and flock goals.