Equine veterinarians have
a responsibility to study the evidence that shoeing is harmful to horses.1-31
At graduation, we swear an oath to use our knowledge to enhance animal
health and we accept, as a lifelong commitment, the obligation to continually
improve our knowledge and competence.
In the last eight years,
a quantum leap has been achieved in the understanding of hoof care.
In the words of the old song, the speed and distance of the leap has
left many veterinarians and farriers feeling bewitched, bothered
and bewildered. The result is that, for a period of time yet,
a widely stretched spectrum of professional opinion will exist, together
with some tension, concerning what is considered to be appropriate hoof
care. At the traditional end of the spectrum, are farriers who combine
their knowledge of hoof anatomy with blacksmithing skills to provide
a metallic system of hoof care that has been firmly in place for over
a thousand years. At the opposite end of the spectrum is the new paradigm
that first emerged in the closing years of the 20th century. These are
barefoot systems of hoof care initiated by two pioneers, a veterinarian,
Hiltrud Strasser, and a farrier, Jaime Jackson. They are based on and
nourished by knowledge gained by research, observation and trimming
to provide physiologically acceptable, non-metallic systems of hoof
care.2,4,5,7
Many farriers, and many veterinarians
who have previously obtained farriery credentials, remain ardent advocates
of shoeing. Though they damn their craft with faint praise when they
concede that shoeing is a necessary evil, they revoke this weakness
by citing the millennium-long history of shoeing, under management strictures
imposed by non-leisure usage, as evidence that horses suffered no ill
effects from such a practice.26
The farrier-cum-veterinarians
are fighting a rearguard action to defend the metallic end of the spectrum.
Feeling the need to stay loyal to their first profession and its traditions,
they are finding it difficult to defend their position in the face of
an increasing army of knowledgeable horse owners who have studied barefoot
hoof care. It is easy to sympathize with their dilemma. As more and
more horse owners demonstrate success in working their horses without
steel shoes, unheeding farriers and veterinarians alike will
become increasingly uneasy at remaining entrenched in the metallic end
of the hoof care spectrum. Utilizing the knowledge of natural hoof form
and function as the basis for barefoot hoof care advances our success
with horses, whereas holding fast to an untenable paradigm leaves hoof
care mired in the past.
I am fortunate to have practiced
at both ends of this spectrum. Having been raised and employed on working
cattle ranches in Arizona, I learned from the wisdom of three generations
how to shoe the horses in order to get the work done. These jobs demanded
long hours of cross-country riding, a chore I recall as being dictated
by necessity rather than choice. I am now aware that it is not only
possible, but preferable, more efficient, and healthier for horses to
work barefoot.
Nevertheless, the entrenched
opinion of most farriers and veterinarians is that horses are simply
unable to work without shoes. It is more correct, however, to say that
their own horses cannot work unshod, while others can. Their opinion
stems from the retention of traditional thinking and, therefore, practices
that have not appreciably changed over the past few decades. There are
those that cling to tradition by portraying modern-day shoeing as advanced
and no longer the harmful practice it was, speaking of "new shoeing
methods" or even using another odd term, "natural principled"
shoeing. But with awareness of hoof biodynamics and of how and why horses
can be trimmed and managed barefoot, these opinions are refuted. In
their place emerges a paradigm for hoof care that enhances the welfare
of the horse.
I submit that any acceptable
method of hoof care should provide the hoof capsule with the ability
to:
- Flex and torque in all
directions in response to changes in terrain
- Assist in the movement
of blood and lymph through weight-driven pump
mechanics
- Protect sensitive inner
structures from physical and environmental variables
- Exfoliate itself in a
process that eliminates old and stimulates new growth
- Transfer sensory information
about the environment to the central nervous system
Such criteria are met by
the unfettered foot: a marvel of engineering that accomplishes these
tasks by virtue of 60 million years of evolution. It possesses structures
based on three very strong shapes...a cone-shaped inner and outer wall
and coffin bone, a dome-shaped sole and coffin bone, and a triangular
frog and bar-heel. This arrangement is healthy and helpful to the horse
only when the hoof can shape itself by movement or be sculpted appropriately
by tools and remain in a dynamic state. Inappropriate sculpting or the
attachment of shoes impedes all these functions and, to varying degrees,
hurts every hoof and harms every horse.
Forcing the flexible hoof
to function when restricted by a rigid, steel shoe is one powerful prescription
for promoting the hoof's deterioration. It results in deformity of the
hoof and other nearby tissues, disrupts physiological processes, and
leads to harmful overgrowth of the hoof capsule. Because when a shoe
is finally removed, the overgrown hoof is trimmed in a manner designed
to ensure the retention of the next shoe (rather than comply with the
physiology of the hoof) additional harm follows. Such trims do not respect
the shape conducive to optimal hoof performance. When a shoe is finally
removed, the overgrown hoof is trimmed in a manner designed to ensure
the retention of the next shoe, rather than comply with the physiology
of the hoof. Additional harm follows; as such trims do not respect the
shape conducive to optimal hoof performance.
Though iron, a thousand years
ago, was utilized as the material of choice to prevent hooves from wearing
down, we now realize that hooves are harmed when fixed in space due
to the rigidity of metal, and fixed in time due to the normal growth
of horn no longer being exfoliated. A review of my clinical records
in equine veterinary practice over the past ten years has revealed that
85% of hoof and leg ailments of all kinds have occurred in shod horses,
including catastrophic limb fractures. Yet the prevalence of shod horses
amongst my clientele during that time was only 48%. The hoof capsule
is a highly evolved and specialized skin. Steel has no redeeming qualities
as a material for protecting skin.
Shod horses have historically
represented what has been thought of as a "higher level" of
care in my area and throughout the equine industry, receiving "better"
nutrition, housing and management than barefoot horses. However, in
my practice, the incidence of limb disease and injury is 70% higher
amongst shod horses. Shod hooves cannot adequately dissipate forces
of torque and concussion. Instead, these forces harm the hoof and are
also referred up the limb to assault other structures that have not
evolved to withstand these stresses and strains. The resultant harm
to the horse's flesh and bone is both predictable and inevitable.
So common are hoof deformities
in our daily clinical experience that many veterinarians accept them
as normal. But upright cylindrical hoof capsules; with high, contracted
heels; long toes; flat, oval soles; and relatively horizontal hairlines
represent common and severe deformities. Normal hooves have sloping,
conical capsules; with low, expansive heels; short toes; domed, round
soles; and 30 degree hairlines. Many veterinarians blame the poor shape
and condition of horse's feet today on genetic flaws, arguing that steel
shoes are necessary to prevent further deterioration and breakage. But
the evidence points to a simple environmental reason for the flawed
feet of our domesticated horses
an overall lack of movement of
both horse and hoof. Foals, from the time they are born, are often confined
on soft footing instead of being allowed to walk and run on firm terrain.
The foals feet are not shaped by the natural wear that should
start in the first few days of life.24
Though we know that bone mass increases until four or five years of
age, many horses are shod at one or two years old. Many adults continue
to live sedentary lives and receive improper trimming and/or are regularly
shod. Any combination of the above variables results in hoof deformities
and small feet for the horse's size. Horses rarely inherit poor feet.
They develop poor quality, atrophied feet due to improper trimming,
confinement, and shoeing. My observations indicate that foals born from
"genetically small-footed" parents with deformed feet have
beautiful, appropriately sized feet when trimmed properly from a young
age, allowed adequate movement, and kept barefoot.
Steel shoes weaken the hoof
capsule. Preparation of a hoof for shoeing begins the weakening process
by removing its strong, natural shape. A normal hoof is not flat in
any plane, having naturally arching quarters, recessed bars and sole.
But these important shapes are eliminated to permit the secure application
of a shoe. A horse left barefoot, but trimmed as for shoeing, has poor
hoof form, an uncomfortable gait, and impaired hoof function. Such improper
trimming leaves an owner with the impression that their horse "can't
go barefoot." The abnormally high pressure on bars and sole harms
the hoof, as well as other portions of the limb and the whole of the
body. With the shoe applied, the hoof incurs further harm through contact
of the shoe with the outer wall. The outer wall has evolved to fulfill
a function that is primarily protective rather than weight bearing.
Increased concussion and constant pressure on the outer wall causes
the commonly seen rippling and buckling of horn tubule and disrupts
the normal flow of the outer wall relative to the inner wall. 7,25
The transfixing metal nails course along the distal aspect of the inner
wall, transmitting the excessive and harmful concussive force from the
shoe through these areas. This breech of external surfaces results in
mechanical disruption of the hoof wall, an unavoidable degree of laminar
separation, the invasion of saprophytic bacteria and fungi, and exposure
of the hoof to extremes of temperature. In addition, shoes inhibit the
pumping system that promotes full circulation in the hoof, so reducing
shock-absorbing ability.1,3 It is also
easy to appreciate how this ischemia interferes with normal horn growth
and metabolism. A congested physiology, with resultant dysplastic, weakened
growth is the result, leading to the severe hoof deformities and leg
diseases we see in daily clinical practice. Shoes provide such an effective
barrier to sensation that their presence automatically debars a horse
from being declared sound at any speed. The definition of a sound horse
should be one free from pain that can walk, trot and canter with animation
and impulsion, on unfettered feet.
In my experience, the terms
"therapeutic" and "corrective" shoeing are oxymorons.
Four years ago, I observed and provided reluctant veterinary support
for a gelding that had prolapsed both coffin bones through the soles
of his front feet and, at this late stage, was finally being managed
on a barefoot hoof care program. Seven months later, this gelding was
being ridden, never having had anything nailed to his feet to support
him through the ordeal. I was accustomed to forecasting one and a half
to two years of healing time when applying the protocol of the Equine
Digital Support System (EDSS), having seen several master farriers use
this system on about fifty such cases. I noticed these horses grew what
appeared to be new hooves, but upon removal of the EDSS appliance they
were still unable to walk normally. When I learned about some barefoot
trimming techniques, I discovered the problem. Realizing that healthy
horses are suspended by their hoof capsules rather than supported by
their soles, it became clear that EDSS and other shoeing protocols encourage
horn growth that remains highly dependent on solar support, ignoring
the need to develop strong laminar suspension. I quickly discovered
that barefoot trimming techniques, boots, and a respect for the normal
physiology of the hoof allowed these horses to grow durable structure
with strong suspension. To "therapeutically" shoe them was
contra-indicated. Healing in a natural manner minimized the redundant
tissue repair and metabolic stresses that otherwise the horses
body had to endure. In this way, feet regained their normal shape and
outperformed shod ones in a shorter time, becoming honestly sound.
Users of EDSS and other shoeing
systems often advocate that the heels of laminitic and foundered horses
should be elevated above their physiological height.30,31
I trust that this regrettable procedure will soon be discontinued, because
laminae become even more stressed and ischemic when heels are elevated
beyond physiologic parameters. The belief that deep digital flexor tendon
tension must be "slackened" to prevent further coffin bone
separation is erroneous. Mathematical equations and structural models
indicate that it is primarily the weight of the horse on a coffin joint
with higher than normal heels, not deep digital flexor tendon tension,
that leads to coffin bone rotation.7 The
majority of foundered horses have deformed heels that are already too
long. To elevate them even higher is contraindicated and harmful. It
robs the horse of the strength and attributes of normal hoof form and
is contrary to the normal biomechanics of the hoof. It causes decreased
circulation, desensitization, severe hoof contraction, coffin bone deterioration
and worsening separation. Surgical transection of the deep digital flexor
tendon adds insult to injury, as it needlessly disrupts one of the important
anatomical components offering dynamic support in the caudal region
of the foot. Foundered horses can be properly managed through respectful
sculpting of their hooves and the judicious use of boots and firm, nonconcussive
terrain. What the inventors of the EDSS appliances intend, and what
the EDSS patients in my practice develop, is wildly different.
Other examples abound, such
as horses with typical navicular-type pain at age two, to teenage horses
with the more classical navicular syndrome.6 When properly
managed barefoot, such affected horses often achieve honest soundness,
and this at a time when traditional veterinary care claims no cure for
such a condition. Navicular problems are absent in horses that have
been trimmed for optimum hoof form and function from day one and allowed
freedom of movement. Instead of investigating these shining examples
and examining these case histories, most equine practitioners continue
to use drugs, special bar shoes and surgical neurectomy to attempt a
"cure". All such affected horses can be seen to have obvious
deformities of their hooves, yet the drugs and shoes prescribed do nothing
to provide these horses with better hoof form. A sad situation exists
when large amounts of resources and money are spent on misguided "therapeutic"
or "corrective" treatments that are contrary to the physiology
of the hoof and only serve to progressively worsen the horse's condition.
The increasing body of evidence
about barefoot rehabilitation techniques and the demonstrably convincing
performance of barefoot endurance horses is both fascinating and compelling.
Other veterinarians that both ride and shoe cite the "impossibilities"
of riding barefoot. I can only say that my own and thousands of other
horses can and do ride barefoot, for hundreds of miles a week, on rocks,
without steel shoes. Clearly, domestic equine hooves can be conditioned
beyond a level that is customary in feral horses. Four short years ago,
I lacked the knowledge of proper hoof form and function and, as a result,
I was unable to salvage many horses with devastating hoof problems.
It was the shoeing and the subsequent progressively debilitating hoof
deformities in these horses that brought them to their end. I realized
I could not, in good conscience, continue to use steel appliances to
bring "healing" to hooves that were deformed due to the use
of such appliances in the first place. Now the horses I see with similar
problems improve in a short time. The knowledge of normal hoof form
and function is powerful. Using it to prevent hoof deformities beats
rehabilitating deformed feet any day, and is the key to honest hoof
health. Pete Ramey is another enlightened former farrier
who no longer uses metal. He writes, "Our goal continues to be
for every horse to outperform its former shod self, and the hooves deliver
this with shocking consistency that amazes me more every day."
28
Other common but unsound
arguments claim that shoes are needed because of the added weight of
tack and rider, the harder terrain, and the extreme sports that are
expected of the modern-day horse. Each of these arguments can be refuted,
in order, on physiological, evolutionary and historical grounds. For
example, the feet of pregnant mares comfortably adapt, in the wild,
to the increased weight of the gravid uterus. Horses evolved in varied
terrrains, including desert, where hard terrain is the norm. The extreme
sport of cavalry warfare was conducted for c. 2500 years without
shoes. For the last two hundred years of this period, horses were carrying
the added weight of armor and equipment. We should recognize
that, on weight bearing, steel shoes hold the sole of the hoof in a
non-weight-bearing, vaulted position against the descending coffin bone.
We misinterpret so-called "stone bruising" of the soles of
shod horses as being caused by stones on the ground. This pattern of
bruising originates from concussion followed by pressure necrosis of
solar corium that cannot escape the blows of the coffin bone above and
an unyielding sole beneath. Bruising of the moonsickle points to a pathology
at the tip of the coffin bone and originates because of excessive heel
height. Another example is the almost 'epidemic' incidence of ringbone
among shod horses in my practice. With or without extra weight, shod
hooves are disallowed vital flexion and torsion, forcing the proximal
interphalangeal and other joints to torque unnaturally. Add to these
stresses the greatly increased concussive forces from the shoe below
7,11,24 and the weight above, and it inevitably
follows that nailed-on shoes are a prescription for disease.
The provision of movement
is an important factor in a barefoot management program.2,4,7,12,13,24
The ideal is turnout 24/7 with companion horses on terrain that, at
least in part, matches the ground on which they have to work. But where
movement cannot be provided, such as for horses in more urban environments
where turnout space is limited, they are still much better off barefoot
than shod. All horses should be provided with dry or well-drained footing
whether kept in confinement or on several acres of pasture but firm,
dry footing is mandatory for those that are confined. Daily riding or
lead exercise is especially critical for the confined horse. Similarly,
when confined, frequent trimming of the hooves is essential to prevent
the onset of imbalances, cracks, infections and overgrowth. Physical
confinement does not necessitate shoeing, but it does necessitate more
regular and careful attention to the hooves and, when riding on rough
terrain, the use of boots. If the unshod feet of stalled horses are
cared for, as outlined, they can remain healthy and sound. To achieve
this goal some simple changes in management become necessary.
My own and other barefoot
horses have hooves that wear slower than steel shoes over a given period
of time. If at first that seems "impossible", stop and appreciate
the critical variables that are the allies of the barefoot horse: time,
wear, growth, callusing and a dynamic existence. Their "unprotected"
hooves grow overnight in response to the wear they receive between daily
rides, whereas shod horses are unable to help themselves with hoof growth
or balance and are totally dependent on the shoes which transfix their
hooves in a predetermined plane. Other interesting comparisons can be
made on the basis of speed, agility and degree of soundness.
Proprioception is significantly
impaired in shod horses.7 Through lack
of sensory feedback, they pay less attention to where their feet are
landing and suffer more trauma from interference, slipping and stumbling
on rocky terrain. Having a normal (i.e. highly sensitive) feedback system,
barefoot horses are more agile, watch where they are stepping, avoid
rocks, and rarely stumble. Due to the superior traction of a yielding
hoof, neither do they slip and slide. The result is healthy, but minimal
hoof wear and a safer, more enjoyable ride for them and their passengers.
Those who ride shod horses on rocky ground know how dangerous it is.
Those who have experienced the confidence of a barefoot horse in such
terrain are most reluctant to get back on a shod horse.
I have documented a decreased
incidence of heart murmurs and lower resting heart rates in my own barefoot
horses, as well as in many barefoot endurance horses. Their cardiovascular
fitness, as judged by cardiac recovery measurements, is superior compared
to shod horses doing similar work.
One of the most compelling
examples of the underlying unsoundness of all shod horses is the crippling
lameness that quickly follows the loss of a shoe. This becomes a serious
problem when miles from home and nails or appropriately sized boots
are unavailable. If shod horses suffer no ill effects from their shoes,
as many professionals contend, why are they so lame within minutes when
walking a short distance without them? Again, the
earlier proposed definition of a truly sound horse comes to mind.
Sound, barefoot horses, when
allowed movement over a suitably demanding terrain, often trim their
own feet. This is the most ideal trim they can get. But many still need
trimming despite having been worked on rough terrain. Though I have
mentioned little about how barefoot trimming is performed, the above
two sentences provide the key. A barefoot trim sculpts the horse's hoof
by mimicking the effects of mileage. If occasions arise in which hoof
wear does exceed growth, boots allow the work to get done.
Boots provide an outstanding
option for honest hoof protection, being made of dynamic materials that
move and recoil to complement a hoof capsule's function.28,29
They are especially helpful in this transition age of hoof care, in
which the need to rehabilitate hooves harmed by shoeing is omnipresent.
The number of new boot designs that have been marketed in the last five
years has tripled, and the demand for new and user-friendly designs
is increasing to the point where supply sometimes fails to meet demand.
Nevertheless, riders find that the more they work with properly trimmed
and conditioned horses, the less are hoof boots needed. "These
days", says Pete Ramey, "I have traded in my metal shoes for
state of the art hoof boots, and I have learned the awesome power in
allowing the off season barefoot healing period to extend
throughout the horses life.28
It is ironic that the iron shoe we once thought offered protection,
support and traction is now known to expose the hoof to harm, deprive
it of support, and render it incapable of providing proper traction.
And these are only a few of the harms that a shoe inflicts.11
There just aren't any good excuses for nailing rigid steel shoes to
horses' hooves, recommending their use, or standing idly by while they
are used. As veterinarians, we should be advocating what is healthiest
for the horses under our care.
Barefoot hoof care works
exquisitely well with the natural horsemanship philosophies of today,
and the welfare of the horse is enhanced. As in any work with a horse,
"asking" instead of "telling" becomes our guide
for trimming a hoof. Horses are only too happy to perform with their
bodies and spirits intact. That spirit of the horse always keeps us
coming back for more. As hoof care specialist Martha Olivo remarks,
"Horses and I just find' each other
we always have. They have
been my best teachers and at many important levels, we keep each other
whole."
It is a grave mistake for
'entrenched' veterinarians to comfort themselves with the belief that
the barefoot movement is unapplicable to horses in certain situations
or no more than a passing fad. It dismisses the fact that this body
of knowledge is securely based on a respect for the horse's inherent
genetic endowments. If we nurture their physiological inheritance, horses
are perfectly able to complete a longer, more fruitful, lifetime of
work. Keeping horses barefoot is a phenomenal win-win situation, offering
increased vitality and performance. Though I can continue to write about
these facts, others must do their own research and use their own observational
skills if they wish to arrive at the same understanding.
Championing the barefoot
cause allows us to comply with the oath we took on graduation. Barefoot
methods of hoof care stand firm on a sound body of knowledge. Farriers
and veterinarians are the best men and women to promote this movement
as they have the necessary broad training, the clientele, the love for
the horse, and the tools. The primary objective is to improve the welfare
of the horse by carefully applying barefoot (i.e. physiological) management
programs. Happily, this brings its own secondary rewards, as such work
is not only more successful and professionally satisfying than the traditional
approach but it is physically less strenuous and safer. For the cooperating
farrier it actually extends his business, as most owners would prefer
not to do their own trimming. The former farrier KC La Pierre tells
his audiences that shoeing is not, as claimed, a necessary evil. The
evil arises, he says, from our lack of understanding of the hoof. It
is this that leads to the belief that shoeing is necessary. Julian Huxley
expressed the same thought in five words, "
false thinking
brings wrong conduct."
The currently divisive spectrum
of hoof care will be less polarized in the future. Similarly, organizations
can expect sports activities that depend solely on specialized shoeing
techniques to wane. Slider shoes that allow for exaggerated sliding
stops, gait-altering shoes that interfere with normal hoof flight arcs,
racing plates with grabs that increase the incidence of injuries, and
other appliances that are used strictly for fashion will be replaced
with barefoot trimming techniques and/or boot designs that do no harm.
We are professionals, pledged
to advance our knowledge and competence and offer it to people who count
on us, without restraints of ego or tradition. Science is a self-correcting
system and, though the corrections are often sadly delayed, they do
eventually take place. For example, we no longer fight disease by blood-letting:
the practice of pin-firing and the use of caustics is on the wane: medial
patellar desmotomy is largely a surgery of the past: and we now know
that riders can communicate better with their horses if the bit is removed,9,14
metal in the mouth being the cause of over a hundred behavioral and
medical problems. Clients will come to us to find out about barefoot
hoof care, to discover how their horses can improve their performance,
and become less prone to a whole host of problems when barefoot. Veterinarians
should be aware that there is a growing dissatisfaction among horse
owners with the traditional hoof care options that are currently being
offered by the profession. Already the climate of opinion among knowledgeable
horse owners is such that an owner whose veterinarian has overlooked,
ignored, refused or failed to offer them the barefoot option might construe
such an omission as an act of negligence.
All of us want nothing less
than faster, more complete healing for our equine patients. We would
do well to take seriously the evidence clearly indicating that horses
should not be shod. Taking the lead in promoting healthy hooves, educating
ourselves, and our veterinary students, is a worthwhile, rewarding project
and it is one that we have a responsibility to adopt. Those who resist
shouldering this responsibility will soon find themselves corralled
by horse owners who have a better understanding of the horse's foot
than they do.
Conclusion
The shod and deformed foot
is a sad and sorry sight, harmful to the horse.
The bare and healthy foot is a joy to behold, and does no harm, of course.
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Art Treatment for Laminitis" Available at http://www.nanric.com/ULTIMATE.htm
2004
[The above list of references,
in year order of publication, includes a dozen books and provides comprehensive
descriptions of the rationale and practice of barefoot hoof care. The
Internet also contains an enormous amount of supplementary information,
case histories and user comment. A Google search on barefoot hoof
care reveals nearly 2000 entries and provides a sense of the intense
interest expressed by horse owners in this new approach, and the worldwide
momentum that this movement has achieved in
the last eight years.]