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Article #309: White Line Disease

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White line disease, a disease of the hoof wall if necessary. The affected area
hoof, appears to be a growing issue. It must remain open and exposed to air and
is a disease that causes the light. Medication may be applied to the
deterioration of the inner hoof wall. If affected area including merthiolate,
undetected, white line disease can betadine or 2% iodine.
progress until it causes complete The amount of exercise that the horse may
separation of the hoof wall and laminae, perform after resection depends on the
resulting in the rotation of the coffin extent of the damage and resection.
bone. The horse owner is to keep the area clean
White line disease is not an issue of and dry, ensuring that the resected area
stable or hoof cleanliness. Horses become is cleaned free of manure and mud. If the
more susceptible to white line disease if resection occurs in the summer, and the
their hooves are cracked, have suffered a horse owner bathes her horse, she should
major trauma, are unbalanced or have ensure that she towel dries the hoof and
chronic infections like abscesses. It the resected area so that it does not sit
affects all breeds of horses and can be wet for long.
found in one or all hooves. Once a resection has been done of the
The disease is caused by a bacteria/fungi hoof wall, the horse is susceptible to
combination. These bacteria and fungi are developing abscesses until the resection
opportunistic in that they normally are has grown out. Horse owners that have
found around the pasture or barn but horses with white line resection should
become pathogenic when given the keep on hand drawing hoof poultices and
opportunity to creep into a cracked hoof packing. One sign of an abscess is the
and thrive in the anaerobic (non-oxygen) "broken leg lameness," where the horse is
environment. They symbiotically coexist extremely lame on the leg that has had
in white line disease. resection some time earlier.
The initial stages of infection do not Though abscesses typically require
cause lameness, and, in fact, by the time soaking in warm water with Epsom salt,
the horse is lame, the disease has done a the horse owner with a horse that has
tremendous amount of damage. white line disease is at a conundrum. The
Early signs include a hollow sound when white line resection area is supposed to
the hoof is tapped with a hammer, a remain dry; yet the most efficient way to
dished or bulge shape in the hoof, tender encourage an abscess to pop is by
soles, heat and a white line that is soft soaking. In this scenario, a horse owner
and chalky. If the horse has lost a shoe needs to confer with veterinarian and
and a chunk of hoof with it, that might farrier to determine the best approach.
signal white line disease. They may determine that packing the hoof
A veterinarian and farrier should work with drawing poultices or hot poultice
together to determine the best course of pads may be in order.
treatment. X-rays may be necessary to After resection and follow up visits by
determine the extent of the damage to the the farrier to maintain the resection,
inner hoof wall as well as to the coffin the only thing the horse owner can do,
bone. If the farrier needs to perform besides keep the area clean and dry, is
therapeutic shoeing, he will also need wait until the damaged hoof has grown
access to those x-rays. out.
The treatment for white line involves a Stop on by our forum at and introduce
resection of the outer wall to expose the yourself. We are always looking for new
diseased inner hoof wall and remove friends! That is why we will leave the
damaged tissue. Therapeutic shoeing (like barn door open. Just visit our links
a heart bar shoe) supports the weakened below in our resource help box.






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