Club foot in horses is a flexural deformity where the hoof grows abnormally steep, caused by a shortening or contraction of the deep digital flexor tendon at the back of the leg. When this tendon tightens, it pulls the toe upward and forces the heel down, creating a boxy, upright hoof that can resemble the head of a golf club in severe cases. The condition can appear in one or both front feet, ranges from barely noticeable to severely debilitating, and can be present at birth or develop during the first year of life.
What Happens Inside the Leg
The deep digital flexor tendon runs down the back of the horse’s leg, passes behind the fetlock and pastern joints, and attaches to the bottom of the coffin bone inside the hoof. When this tendon contracts or fails to grow as fast as the bones it supports, it essentially pulls the front of the hoof upward. The hoof capsule responds over time by growing more heel and less toe, producing the characteristic steep angle.
Researchers still aren’t certain whether the shortening originates in the muscle, the tendon itself, or a combination of both. One theory points to specialized cells in the tendon and its supporting ligament that contain smooth muscle fibers, which may generate a contractive force independent of the muscle above. Regardless of the exact mechanism, the result is the same: the tendon is too short relative to the bone, and the hoof distorts to compensate.
Congenital vs. Acquired Club Foot
Club foot can be present at birth (congenital) or develop in the weeks and months afterward (acquired). Congenital cases may relate to abnormal positioning in the uterus or genetic factors, and they’re often visible within the first few days of life.
Acquired cases are far more common and typically show up between two and six months of age. The underlying issue is a growth mismatch: the bones in the leg are lengthening faster than the deep digital flexor tendon can keep up. Foals are especially prone to this when they nurse from a heavy-milking mare, have a genetic tendency toward rapid growth, or are over-supplemented with concentrates like extra protein, carbohydrates, minerals, or vitamins. Any combination of these factors can trigger a growth spurt that outpaces tendon development.
How Club Foot Is Graded
Club feet are classified on a scale of 1 to 4, with each grade reflecting increasing severity based on the hoof angle and visible changes to the hoof wall.
- Grade 1: The affected hoof is 3 to 5 degrees steeper than the opposite foot. The coronary band (the growth line at the top of the hoof) appears more pronounced than normal. Many owners don’t notice this stage without a farrier pointing it out.
- Grade 2: The hoof angle is 5 to 8 degrees steeper than the other foot. Growth rings on the hoof wall are noticeably wider at the heel than at the toe, a sign the heel is growing faster. After trimming, the heel may not fully contact the ground.
- Grade 3: The front of the hoof wall develops a visible concavity, curving inward rather than running straight from the coronary band to the ground. Growth rings at the heel are roughly twice the width of those at the toe.
- Grade 4: The hoof wall is severely dished, the hoof angle reaches at least 80 degrees, and the coronary band sits nearly horizontal to the ground. At this stage the horse is essentially walking on the front edge of the hoof, and the coffin bone inside may be rotating.
Grades 1 and 2 are the most manageable and respond well to early intervention. Grades 3 and 4 carry a much higher risk of chronic lameness and long-term soundness problems.
Recognizing It Early
The first sign most owners notice is that one front hoof looks different from the other. The affected foot appears taller, more boxy, and has a steeper angle when viewed from the side. Over time, the toe may start to dish inward, and the heel will grow faster, making the hoof look even more upright after each trimming cycle.
Young foals with an acquired club foot often develop a subtle change in gait before the hoof shape becomes obvious. They may land toe-first instead of flat or heel-first, or they may seem slightly “knuckled over” at the fetlock. Comparing the two front feet side by side is the quickest screening tool. Any difference of more than a few degrees in hoof angle warrants a closer look.
Veterinarians confirm the diagnosis with lateral radiographs (X-rays taken from the side), which reveal the alignment of the coffin bone relative to the hoof wall and pastern. These images show whether the bone has begun to rotate inside the hoof capsule, which is a critical factor in deciding how aggressively to treat.
Nutritional Management for Foals
Because acquired club foot is driven by a mismatch between bone growth and tendon growth, slowing the growth rate is one of the first steps. This means reducing caloric intake, not eliminating it. The goal is to bring growth back to a sustainable pace so the tendon can catch up. Foals on rich pasture or receiving grain supplements may need their concentrate intake cut back significantly, and mares producing heavy milk may need dietary adjustments as well.
Starvation or severe caloric restriction is counterproductive. When a foal is underfed and then returned to normal feeding, the body responds with a compensatory growth spurt that can make the problem worse than it was before. A steady, moderate growth curve is the target.
Corrective Trimming and Shoeing
For Grade 1 and many Grade 2 club feet, skilled farriery is the primary treatment. The instinct is to simply lower the heels to “fix” the steep angle, but this approach can backfire. Aggressively lowering the heels increases tension on the already-tight deep digital flexor tendon, which pulls harder on the coffin bone, reduces blood flow to the toe, and creates a cycle where the toe grows even less and the heel grows even more.
A more effective approach involves trimming the heels back from the widest part of the foot toward the frog, then compensating for the removed heel height with a specialized shoe. One common option is a rocker or “banana” shoe, which has a gentle concave curve forged from heel to toe. This shoe positions the breakover point (where the hoof leaves the ground during a stride) directly under the tip of the coffin bone, eliminating leverage on the hoof wall and laminae. The result is more even blood flow throughout the sole, which promotes balanced hoof growth over time.
The trim and the shoe must work together. The belly of the shoe sits under the center of rotation of the foot, allowing the horse to use the rocking motion naturally. Done correctly, this combination produces robust, even hoof growth and avoids the toe flares that commonly develop when club feet are trimmed flat.
When Surgery Is Needed
Horses that don’t respond to trimming and nutritional changes, or those presenting at Grade 3 or 4, are candidates for a procedure called an inferior check ligament desmotomy. The inferior check ligament connects the deep digital flexor tendon to the cannon bone on the back of the leg. Cutting this ligament effectively lengthens the tendon unit, releasing the tension that’s pulling the hoof into a club shape.
The surgery is performed under general anesthesia or standing sedation, depending on the horse’s age and temperament. The surgeon isolates the ligament through a small incision on the back of the cannon bone region and cuts it completely. When all fibers are transected, the ligament gaps apart, especially when the toe is extended, confirming that the tension has been released.
Recovery involves stall rest and controlled exercise over several weeks, with corrective trimming continuing throughout. The earlier this surgery is performed in a young horse’s life, the better the outcome, because the hoof capsule is still growing and can remodel toward a more normal shape. In older horses, the surgery can still relieve tension and improve comfort, but the hoof may retain some degree of abnormal shape permanently.
Long-Term Outlook
Mild club feet (Grades 1 and 2) that are caught early and managed with proper trimming and nutrition often allow the horse to perform at a high level throughout its career. Many successful sport horses and racehorses have low-grade club feet that are kept in check with regular farrier cycles every four to six weeks.
Higher-grade club feet carry more risk. Even with surgery, Grade 3 and 4 cases may develop secondary problems like chronic sole bruising, white line disease, or early-onset arthritis in the coffin joint due to years of abnormal loading. The key variable in every case is timing. A club foot identified at two months of age and addressed immediately has a fundamentally different prognosis than one discovered at two years, when the bones have finished growing and the hoof capsule has spent months remodeling around an abnormal alignment.
Consistent farrier care remains important for the life of the horse. Even after successful correction, the underlying tendency toward tendon tightness doesn’t fully disappear, and skipping trims can allow the hoof to drift back toward a steeper angle.