What Causes Foot Rot in Cattle?
The bacteria behind foot rot, mainly Fusobacterium necrophorum, live in the manure and soil of every barn. That is not the problem on its own. The problem is when they find a way through the skin between the claws.
Two things create the opening they need.
First, wet conditions. Manure-soaked alleyways and muddy loafing areas soften the interdigital skin over time. Soft skin breaks down faster and cracks more easily. Second, physical damage. Rough concrete edges, sharp stones, broken slats, or crowded alleys that push cows into awkward steps all cause small cuts and abrasions. Those cuts are the entry point.
Overcrowding makes both problems worse. More cows mean more traffic, more manure on the floor, and less chance for any cow to find a dry place to stand. Transition cows are especially vulnerable. Their immune response is already stretched around calving. In my experience, a fresh cow can develop full foot rot within 48 hours of that initial skin break.
Where on the Hoof Is Foot Rot Found?
Foot rot starts in the interdigital space, the skin between the two claws. That is where the bacteria get in.
From there, the infection moves into the soft tissue above the claws. The swelling sits centered above the joint between both claws, evenly on both sides. The claws themselves are often in perfect condition. The skin between the claws frequently breaks open, and there is a foul smell that is hard to mistake.
Foot rot does not stay in the foot. Left untreated, the infection can travel up into the leg and from there into the bloodstream. That is why prompt treatment matters so much.
The lameness and swelling from foot rot comes on rapidly and sits centered above both claws, not on one side. A cow walking well in the morning and severely lame by night is foot rot until proven otherwise.
How to Tell Foot Rot From Other Hoof Diseases
Foot rot gets misdiagnosed more than any other hoof disease I see on farm. It is confused with digital dermatitis, interdigital dermatitis, and hoof abscesses, all of which can cause sudden, severe lameness. Getting the diagnosis wrong means the wrong treatment, and the disease keeps moving through the herd while you treat for something else.
The sentence I use with my clients is this: the lameness and swelling from foot rot has a rapid onset and is centered above the claws. The animal walked well this morning and is severely lame tonight. Digital dermatitis and interdigital dermatitis do not come on like that.
The second test is the swelling itself. If the swelling sits off to one side, above one claw only, it is most likely not foot rot but another hoof disease. A hoof abscess, for example, will swell on one side. Foot rot swells the soft tissue above the joint between both claws, centered evenly.
Foot rot is an infectious disease. Non-infectious horn diseases like laminitis and corn affect the hoof differently and require different treatment. When in doubt, examine carefully and bring in your veterinarian. The How Does Foot Rot Affect a Cow's Performance article goes deeper into differential diagnosis with real farm examples.
How to Prevent Foot Rot
Preventing foot rot comes down to managing the environment that lets the bacteria in, and catching problems early when they do get through. A few practices that work consistently:
How to Treat Foot Rot
As a hoof trimmer, I am limited in what I can do for foot rot. This is a disease that needs your veterinarian. What I can tell you is that prompt, proper treatment is what controls it.
A wrap traps the infection fluid so it cannot drain, and the infection climbs higher into the leg. In mild cases where I suspect foot rot alongside possible digital dermatitis, I have used Intra Hoof-fit Gel with a wrap, but in any case where foot rot is involved, that wrap comes off within 16 to 24 hours.
One organic dairy farmer I work with cannot use antibiotics. He developed his own field setup: a rubber hoof boot filled with warm water and Epsom salt. He reported solid results. Warm water and Epsom salt is a recognized supportive soak useful while waiting for veterinary consultation.
That setup was his own field improvisation, not a DHC protocol. Any alternative treatment path should be discussed with your veterinarian.
There is a more aggressive form that does not respond to standard antibiotic treatment, sometimes called super foot rot or virulent foot rot. If a cow shows no improvement after three to four days of treatment, or if the swelling is moving up the leg, call your veterinarian immediately. This is not a situation where more of the same treatment will turn it around. I have seen what happens when it is caught too late, and it costs you the cow.
Products Used Around Foot Rot
These products come up in the foot rot conversation on the farm. None of them is a treatment for foot rot. An active infection needs your veterinarian.
Hoof Sol Bath
A Health Canada registered Veterinary Health Product for footbath use that promotes healthy hooves and healthy skin. Used regularly at a 5% solution, it reduces bacterial load in the barn environment. Also available as Hoof Sol Bath Flex for automated footbath systems.
View Product
Intra Hoof-fit Gel
Registered in Canada for digital dermatitis treatment. Where digital dermatitis is present alongside foot rot, treat the DD as labeled and the foot rot with your veterinarian. A wrap on a foot rot case must come off within 16 to 24 hours.
View ProductRepiderma
A Health Canada registered Veterinary Health Product that promotes healthy hooves and healthy skin. Approved for use on certified organic farms in Canada.
View ProductFrequently Asked Questions About Foot Rot
How do you tell foot rot from digital dermatitis?
Foot rot comes on fast. The swelling sits centered in the soft tissue above the joint between both claws, not in the claws themselves. A cow walks well in the morning and is severely lame by night. Digital dermatitis is slower. It shows as a red or gray lesion at the back of the heel and does not cause that kind of swelling above the foot. If the swelling sits off to one side, it is probably not foot rot.
What causes foot rot in cattle?
The bacteria behind foot rot, mainly Fusobacterium necrophorum, live in the manure and soil of every barn. They cause disease only when they get through the skin between the claws. Wet conditions soften that skin over time, and rough or sharp surfaces cut it. Both create the opening the bacteria need to get in.
How is foot rot treated?
Foot rot needs your veterinarian. Treatment is an intramuscular antibiotic, given as early as possible, often alongside pain medication. Trimming the affected hoof removes infected tissue and improves footing. Keep the cow isolated near feed and water. Do not wrap a foot rot foot, because the infection fluid cannot drain and the infection climbs higher into the leg.
What does foot rot look like?
Foot rot shows as sudden, severe lameness with even swelling in the soft tissue above the joint between both claws. The claws themselves are often unaffected. The skin between the claws frequently breaks open, and there is a strong foul smell. If the swelling sits off to one side instead of centered evenly above both claws, it is probably a different condition.
How long does foot rot take to heal?
Most cattle treated promptly with the right antibiotic show clear improvement within 48 to 72 hours. If a cow shows no change after three to four days, contact your veterinarian. A more aggressive form, sometimes called super foot rot or virulent foot rot, does not respond to standard antibiotic treatment and needs immediate attention. Do not wait it out.
Foot rot is common, and it moves fast, but it is not a mystery. The bacteria are always in the barn. What you control is the environment that lets them in and how quickly you act once a cow goes lame. Keep the footing dry, walk your cows, and treat early. That is what keeps foot rot from costing you a cow.
Foot rot, digital dermatitis, and interdigital dermatitis are all infectious diseases that attack the soft tissue of the foot. Non-infectious horn diseases like laminitis, sole ulcers, and white line disease hit the hoof structure itself. When you are standing at the chute and not certain which you are dealing with, this chart puts the common hoof diseases side by side so you can make a proper diagnosis before deciding on a treatment.
Download Free ChartResearch Cited on This Page
- Conneely M. and Ryan E. (2024). Shedding light on the cost of lameness. Teagasc, 30 April 2024. Cost per case in Irish dairy herds: foot rot €308.14, including treatment, lost milk production and fertility. Teagasc
