White Line Disease in Horses: Causes, Treatment, and Prevention after Laminitis

What is a hoof crack in horses?

A hoof crack, also known as a sand crack or hoof fissure, is a condition characterized by vertical or horizontal cracks in the hoof wall. This condition is particularly common in horses that have suffered from laminitis, as the inflammation of the internal tissues weakens the horn structure of the foot.

These cracks can be superficial or deep, and in severe cases, can reach the sensitive underlying tissues, causing pain, lameness, and a risk of infection.

Causes of hoof cracks after laminitis

Laminitis creates favorable conditions for the development of hoof cracks:

• Inflammation of podal tissues: Laminitis damages the lamellae of the foot, disrupting the production of quality horn.
• Hoof deformation: Rotation or sinking of the coffin bone alters the distribution of stresses.
• Altered horn quality: The horn produced after laminitis is often fragile and brittle.
• Foot imbalance: Inappropriate trimming or irregular growth promotes tension.
• Excessive humidity: Alternating humidity and dryness further weakens the wall.
• Nutritional deficiencies: A deficiency in biotin, zinc, or sulfur amino acids compromises horn quality.

Symptoms and diagnosis of hoof cracks

Early recognition of a hoof crack allows for intervention before it worsens:

• Visible crack on the hoof wall (vertical, horizontal, or oblique)
• Lameness varying with the depth of the crack
• Increased sensitivity to pressure or exploring tongs
• Widening of the crack when bearing weight
• Bleeding or oozing if live tissues are affected
• Risk of secondary infection with heat and swelling

A veterinary examination and X-rays can assess the extent of internal damage and adapt the treatment.

Treatment of hoof cracks: a holistic approach

1. Corrective trimming and appropriate shoeing

The farrier plays an essential role:

• Regular trimming to rebalance the foot and limit stresses
• Therapeutic shoeing (bar shoe, resin) to stabilize the crack
• Staples or lacing to prevent the crack from widening
• Unloading of sensitive areas

2. Local care and protection

The cracked area requires careful attention to promote healing and prevent infection:

• Daily cleaning: Keep the area clean and dry.
• Protection against humidity: Apply OZONE HOOF CARE to create a protective barrier against mud and humidity while sanitizing the area.
• Filling the crack: Use OZONE HOOF FILLER to fill cracks and cavities, protect sensitive tissues, and promote healthy regrowth.
• Cover soles and frog: Use OZONE FROG CARE to strengthen the underside of the foot.

3. Nutritional support

An appropriate diet promotes the production of quality horn:

• Biotin supplementation (20-30 mg/day)
• Intake of zinc, copper, and sulfur amino acids (methionine, cysteine)
• Essential fatty acids (omega-3)
• Balanced diet adapted to the metabolism of the laminitic horse

Prevention of hoof cracks after laminitis

Prevention is better than cure, especially for a horse that has suffered from laminitis:

• Laminitis management: Treat any laminitis crisis quickly and effectively.
• Regular trimming: Adhere to an adapted trimming schedule (every 4-6 weeks).
• Rigorous hygiene: Keep hooves clean and dry.
• Preventive protection: Regularly apply OZONE HOOF CARE in humid conditions.
• Optimal nutrition: Ensure a sufficient intake of essential nutrients for the horn.
• Adapted environment: Avoid ground that is too hard, too soft, or constantly wet.
• Monitoring: Inspect hooves daily to detect any early signs.

Healing time and prognosis

The healing of a hoof crack is a long process that depends on several factors:

• Depth of the crack: A superficial crack heals in a few months, a deep crack can take 8-12 months.
• Quality of care: A rigorous protocol accelerates healing.
• Growth rate: Horn grows on average 6-10 mm per month.
• General condition of the horse: A healthy horse heals faster.

With appropriate care and a holistic approach, the prognosis is generally favorable, although patience is required.

When to consult a veterinarian?

Consult quickly in case of:

• Severe or worsening lameness
• Signs of infection (heat, swelling, purulent discharge)
• Crack that extends or deepens despite care
• Bleeding at the crack
• Doubt about the severity of the injury

Conclusion

Hoof cracks are a common complication after laminitis, but they can be effectively managed with a holistic approach combining adapted trimming, local care, and nutritional support. Natural ozone solutions, such as OZONE HOOF CARE and OZONE HOOF FILLER, offer effective protection and promote healing without irritating tissues.

The key to success lies in patience, regular care, and close collaboration between owner, farrier, and veterinarian to guide the horse toward complete recovery.