Growing Pains

I've often wondered about the significance and the origins of what I might label the arbitrary four-week shoeing cycle, and its strict adherence by some owners, trainers and stable managers. I recognize scheduling is simplified when the shoeing occurs the same day every month. However, having now done this job for some time, I have identified many circumstances where horses would benefit with more time in between shoeing and on more than one occasion that has been my recommendation (accepted or not).

Unfortunately, there are some non-farrier professionals who fail to recognize how frustrating it can be for a farrier in situations where there is little or nothing to do when addressing a horse's hooves. This is especially true in examples of horses with poor feet, odd hoof conformation, and the often-associated lack of hoof growth. Most unnerving are the circumstances connected to top performers, and a farrier's singular mission to ensure soundness and optimal performance against all odds. Interestingly, in top performers of any sport or discipline, there exists some correlation between superior performance and hoof-related issues.

Routine struggles can be commonplace with some farm managers' insistence on tight schedules due to travel or competitions, often overriding or disregarding individual horse needs. On these occasions, virtually little or nothing can be done from a trimming standpoint and farriers find themselves going through the motions. It seems counterintuitive and possibly even detrimental in one's attempts to maintain and/or improve the hoof's integrity, often resulting in more nail holes, broken hoof walls, possible results from the stress, pressure and “The torque of the shoe's marriage to the dynamic hoof.

Often, owners and trainers are nearby keeping a close eye, a predictable scenario when working on their top horses. Occasionally they chime in, “you did nothing” or quizzically “not much foot there.” Usually I have a quick persnickety reply, “I get paid for what I leave on and not what I take off,” borrowing from an old timer.

How does a younger, less experienced farrier react to those occurrences and statements?

Undoubtedly, the unspoken pressure results in some obligation to do something greater than lightly rasping and repositioning the shoe for compensation, which can lead to unnecessary invasiveness, harmful to the foot and the horse's soundness.

It stands to reason, very simplistically, taking something flat and rasping it flatter probably won't increase or improve the vertical depth of the coffin bone, but maybe extra time with correctly executed interventions could.

So how long does it take for the hoof to grow, what may affect growth, and how can positive hoof growth be promoted? There are many factors which are believed to influence the hoof's quality and the amount of future growth, but there are also as many mysteries. Any attempts to make a convincing argument on this topic that 100% applies can prove elusive. There is always one horse that can make you a liar. Some horses can routinely grow significant amounts of hoof, but why that is can only be theorized. Hoof growth can be quantified by measurements of the toe's length with changes equaling 1/4 to 1/2 inch or more. Farrier visits and time in between certainly can affect this measurement. However, there are always exceptions and some horses may require shorter periods of time (three weeks) in between appointments, while others can go longer (six to eight weeks). When considering the shod hoof, the frequency of visits are primarily dictated by the ability to maintain the shoe's integrity, perhaps the farrier's greatest challenge.

It's universally acknowledged that it takes approximately one year for the hoof to grow from the top of the coronary band to the bottom of the foot. Old-school horsemen often preached the belief of the dam's influence on her offspring's hoof conformation and presentation, something I can directly attest to (including a propensity to kick). Genetics aside, diet, environment, terrains, work, conformation, injuries, climate, weather, moisture or lack thereof, and the time of year, as well as previous farrier interventions, all directly influence hoof growth. The most often overlooked influence on hoof growth are forces and pressures experienced, encountered, absorbed, and dampened, affecting circulation and a hoof's ability or inability to allow healthy blood flow which plays the most significant role in overall foot health and future growth. The hoof grows away from pressure, so low-heeled hooves have increased heel pressure and restricted blood flow promoting the foot's forward migration. Conversely, the same can be said with the presentation of high heels, shorter toes, medial, or lateral pressures.

Certainly, all of this trimming and 'balancing' keeps us farriers in business and recent changes in thought have owners and trainers considering individual needs instead of the calendar to the horse's betterment. This shift in thinking likely comes as a result of previous experience and unintended negative consequences.

Regrettably, time may never be on our side and overriding factors may fail to account for the time needed for optimal hoof growth. Shoeing schedules vary throughout the world, with greater amounts of time elapsing in between farrier visits, however, economics and environment may influence those practices.

In the end, the foot can only grow with time, proper nutrition, care, and maintenance. It's amazing how resilient the foot can be and it's always advisable to follow the recommendations of one's farrier or a knowledgeable professional. They may likely suggest the application of certain approved hoof dressings and/or topical ointments to the coronary band or sole meant to stimulate blood flow, hoof growth and/or enhance protection. The added extra steps actually work and most farriers report an ability to detect improvements.

   Jude Florio, who has served as a professional farrier for over 20 years, is also a patented inventor having earned a graduate diploma from the University of London's Royal Veterinary College in Applied Equine Locomotor Research. He is among the current MSc Equine Science cohorts researching the effects of farrier interventions at the University of Edinburgh, Royal 'Dick' School of Veterinary Studies (June 2023).

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It’s All about Sole

“It's all about soul…Yes, it is.” The title and line from Billy Joel's 1993 hit refers to unmeasured essence of our being, and the same may be said also about another kind of sole, the hoof's sole, which is an often-overlooked, under-studied insensitive structure of the hoof that fails to get much attention until there is a problem. The failure to care for the sole's well-being, like its homophone cousin (soul), may have deeper implications and longer-lasting consequences for the soundness of the horse that it is attached to.

The sole is a keratinized structure similar to the wall, growing at the same rate as the horn and designed to resist wear with a primary function of protecting the bottom of the coffin bone. The sole's flexibility and thickness vary, often effected by environmental conditions (wet or dry), hoof morphology, pathology, and a host of other factors (breed, size, stabling, turnout, etc.), all which may affect its makeup. The sole's design is to flake away or exfoliate over time, however, flaking or exfoliation is again dependent upon a number of factors including those previously listed, all affecting its composition. Horses can have thick, thin, or false soles. The ability to identify the type of sole, and how much can be removed, requires experience.

To properly 'read' a foot for trimming, balancing, or shoeing, farriers with their hoof knife in hand remove varying amounts of sole and the practice differs within the industry. The amount of sole and from where it is pared is an often-argued conversation amongst farriers, old and new, in journals and trade publications. Everyone has a theory and everyone has an opinion.

Is there a point where sole paring goes too far?

Many years ago, in seemingly another lifetime, I had the good fortune to meet and apprentice for the late James Cahill of Lamberville, N.J. Cahill, a Vietnam veteran returned from his service, trained Thoroughbreds for his then-father-in-law in the New England area. Cahill recounted to me how he was fascinated by shoeing and somehow the need arose for him to learn how to shoe, most likely a need to tack a shoe [this story is sounding familiar to me, as I had a similar experience]. He would always laughingly describe how he remembered paying his plater to teach him and at some point, later while still in the midst of learning, recognized that he was still paying his plater to watch him while he shod his own horses. Cahill later transitioned from training to shoeing full time which segued to shoeing riding horses.

The horseman's style was to repeatedly pare the sole; his knife was always unbelievably sharp. I recall him pressing with his thumb, paring, and pressing again while sometimes going a little too far and finding what farriers refer to as 'bottom'–or even farther with the infrequent droplet of blood. Obviously, being a good apprentice and direction follower, I copied my teacher with his sole paring style. I later learned when I went on to work for legendary USET and Hall of Fame farrier Seamus Brady that this practice of sole paring was not going to fly with him. I recall on my first day when I started paring out the sole of the horse that I was working on, Brady apoplectic, bellowing in his Irish accent, “Whoa, whoa, whoa, what the hell are you doing? We don't do that in this world.” He later explained after I was stopped in my frenzied sole-removing tracks, that the horse needs as much protection as it can get and removing the sole was essentially removing protection, an argument supported by Dr. Scott Morrison, partner and founder of the Podiatry Center at Rood & Riddle Equine Hospital in Lexington.

Dr. Scott Morrison, DVM | Courtesy Rood & Riddle

I was grateful to catch a moment with Morrison in between his in-demand, reported seven-day-a-week schedule as he agreed to share his thoughts on this topic. As with all things sole (soul) related, the conversation pivoted and delved deeper into some issues the industry continues to face.

Having had some overlap with Morrison over the years, I recently worked closely with him on a new account that I was enlisted to take over and he was recruited by the owner to consult. Humble is an understatement describing Morrison. In an industry where ego and chest beating are the drivers, humility and a willingness to share knowledge is refreshing. Brady exhibited similar traits. Morrison's demeanor, approach, and professionalism is almost surprising considering his influence in the industry, following other veterinary podiatrists, who Morrison labels 'pioneers,' like Dr.'s Ric Redden and Steve O'Grady.

Ninety percent of Morrison's practice consists of the podiatric care of Thoroughbreds, from corrective work on foals, to racing athletes, to the geriatric horses found at breeding facilities. The complaints range from knee deviations in foals commonly known as carpus valgus or varus, to thin soles, chronic heel pain, negative palmar angles, and–normally found in geriatric breeding mares and stallions–chronic low-grade laminitis.

When asked specifically about the sole and the varying farrier practices in the amount of sole that is pared out, Morrison shared that he, as well as other members of Rood & Riddle's practice, “leave as much sole as they can.”

“It still is commonly done, perhaps a little too much,” Morrison added in reference to the common practice of paring significant amounts of sole at the track. I was always under the impression that what may be considered extreme paring was an effort to create a 'cup' for traction, or to achieve the 'shortest' foot possible to relieve sole pressure under the shoe. However, Morrison thinks there may be other simpler motivations at work.

“People [farriers] like seeing a nice, cleanly pared-out foot. It looks nice. However, carving out the sole propagates flares, thinner soles, and this compromises the foot. The sole holds the foot together and a natural arch exists, a natural cup. The arch is really strong, we see it in design and architecture. [Farriers] continually weaken that dome causing the soles to collapse by removing some thickness, which changes the contours of the foot, creates flares, and the common issue: flat feet, where the arch is lost at the back half of the foot. The sole and lack of it in the back half of the foot is a very common complaint.”

An example of Morrison's frog support | Courtesy Dr. Scott Morrison

Morrison underscored that much of his time is spent restoring that natural arch and trying 'fix' its collapse by “leaving in the bars” [in certain instances dependent upon the foot] and as much sole as possible. He shoes with as much support as necessary, always trying to “mimic the barefoot condition” with the use of heartbar shoe, pads, and frog support while recognizing the realities of the horse's tolerances relating to frog and sole pressure. He also stressed there is a right and wrong way to apply these interventions as “not all bar shoes are equal.” However, Morrison highlighting some of the issues may lie with trainers and their tendency to want to see a 'normal' shoe even when “heels are crushed and the frog is dropping out of the bottom.” Morrison labeled it at times as a “battle” to get frog support or in other instances when a farrier must “do what is needed for the horse.”

Asked if this resistance by some trainers to see a properly applied shoe with frog and/or heel support may be the result of a perceived negative effect on performance he said, “I don't think so. You can train him in a bar shoe, or heartbar, and pull it off for race day,” when opting for regular shoes.

While not entirely buying into the argument that breeding may perpetuate some of these foot issues in Thoroughbreds, he did not completely discount breeding's role, however, he admitted that he has witnessed things turn around in horses where the feet “became pretty good.”

Effectively, the greater issues that Morrison highlights are the realities of continuous training.

“There is no time off,” he said. “Pulling shoes is so important because feet need to be let down. The result, to some degree [the feet] will normalize.”

It's All About Sole…and Then Some…

So where is the industry going? Where should it go? Will things ever become standardized?

Morrison, who was likely driving to his next appointment while facing the barrage of questions that I lobbed at him like hand grenades, chuckled a few times at some of my more loaded questions. I knew the answers would be good.

“There are different camps of thought [relating to industry practices]. I don't really see things changing in the near future,” he admitted.

Firmly believing that the current reality perpetuates good farriers continuing to acquire top clients, Morrison explained that their good methods will most likely be passed along to future apprentices and helpers, as has always been the tradition.

“Some disciplines may trend to doing things more uniformly,” he said.

Morrison segued into some failures on the part of the Thoroughbred industry to promote continuing education for farriers at racetracks which he labels a “big need.” He highlighted farriers in other disciplines [riding horses] tending to actively read trade magazines and attend conferences, while “platers are less represented.”

He added, “It would be nice to see a big shoe company or big owner” sponsor and promote some continuing education programs for farriers at the racetracks.

I agree.

Jude Florio, who has served as a professional farrier for over 20 years, earned a graduate diploma from the University of London's Royal Veterinary College in Applied Equine Locomotor Research. He is among the current MSc Equine Science cohorts studying at the University of Edinburgh, Royal 'Dick' School of Veterinary Studies (June 2023).

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Equine Obesity Connected To Increased Chance For Laminitis

Obesity in domesticated horses is a growing problem, Dr. Shannon Pratt-Phillips, and equine nutritionist at North Carolina State University, told the American Farriers Journal last week. One primary concern is that obesity can increase a horse's chance of developing laminitis, the potentially deadly inflammation of sensitive layers of tissue (laminae) inside the hoof.

Pratt-Phillips explains that fatty tissue is an inflammatory organ, which produces compounds that lead to inflammation in multiple different parts of the body. Those compounds can negatively affect the vasculature within the laminae, increasing the possibility for laminitis.

In addition, excess weight can have a negative effect on the horse's overall hoof health.

“Proper blood circulation is partly attributed to the compression and expansion of the digital cushion within the hoof,” Pratt-Phillips writes. “If a horse is carrying excess weight, the digital cushion's function may be compromised, resulting in poor blood circulation and laminitis.”

Of course, more weight can also cause strain on the hoof wall as it expands to absorb the concussion of a horse's movement.

“Over time, obesity may disrupt the integrity of the hoof wall, resulting in cracking or crumbling hooves,” wrote Pratt-Phillips.

Read more at the American Farriers Journal.

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Breakthrough Laminitis Research Opens Potential New Avenues For Treatment

Horse owners usually dread hearing the diagnosis of “Laminitis.” The disease plagues horses of many backgrounds, ages and disciplines. Using genetics, UF/IFAS and University of Pennsylvania School of Veterinary Medicine scientists have made a breakthrough in the disease thanks to funding from The Foundation for the Horse.

A horse's hoof has a tough job. It must support a heavy animal which can move faster than 40 mph. Laminitis occurs when inflammation and damage of the tissue takes place between the hoof and coffin bone. It causes lameness, a diminished quality of life and often results in euthanasia.

“Laminitis is a tough problem for the horse and its owner,” said Dr. Samantha Brooks, UF/IFAS associate professor of equine physiology. “We have very few tools in our arsenal to manage the disease itself. We treat symptoms, pain and mechanical instability but do not have anything to target the cause just yet.”

Laminitis studies have previously been hindered by the scarcity of genetic information specific to hoof tissues. Scientists tapped into the University of Pennsylvania's New Bolton Center Laminitis Discovery Database, an archive of data and sample sets from naturally occurring laminitis cases collected since 2008. Using that database, researchers examined 36 archived tissues of 20 Thoroughbred horses treated for laminitis.

There are three types of laminitis, and all impair the structure and function of the horse's foot. This research provided a snapshot of the active pathways and functions of the hoof, with a focus on supporting limb laminitis – the laminitis to which famous racehorse Barbaro succumbed.

“We understand the situations that trigger an episode of laminitis, but we do not have a good understanding of what is happening in the hoof,” said Brooks. “This study took a very comprehensive view of the processes early in the development of laminitis.”

Using gene expression analysis, researchers catalogued the changes in gene transcription across the 20 horses. Some had healthy feet, some were early in the disease process and others were more severe. Researchers identified trends in the disease process.

“By tapping into my lab's database and incorporating Dr. Brooks' unparalleled expertise in equine genetics and transcriptome analysis, we have identified new and promising pathways in cell stress and inflammatory response that significantly enhance our understanding of supporting limb laminitis and its disease processes,” said Hannah Galantino-Homer, VMD, PhD, DACT, senior investigator in Laminitis Research at Penn Vet's New Bolton Center.

The research resulted in three key findings.

The first related to keratin, an important structural protein that helps maintain the structural integrity of materials like hair, nails and horse hooves. This study was one of the first to examine the changes in the keratin family through the laminitis disease process. Some of the keratin-related genes and regulation of the cell's manufacturing process started to diminish as the disease began. This could be compared to when a car gets a flat tire; it may still be running but it loses appropriate function and slows down.

Another type of cell machinery often studied in laminitis are a class of enzymes called metalloproteinases; enzymes that help maintain the cytoskeleton. These enzymes must maintain a careful balance. Hooves must be able to grow and not break down under the weight of the horse, which requires a balance of remodeling and building tissues within the hoof. When the metalloproteinases become too active, the hoof begins to lose structural strength. One previous theory for treating this process was to stop these enzymes from becoming too active. But treatment targeted these enzymes might also stop hoof growth, which would likely lead to further issues.

When keratin degrades, inflammation in the hoof leads to laminitis. Scientists found a collection of genes responsible for triggering that inflammation which could pave the way for future medications to treat the inflammation. The genes led researchers to believe that some human inflammatory medications for autoimmune disorders may help horses with laminitis.

Changes in gene expression in diseased tissue are often reflected in changes in the proteins that can be detected in the blood as the disease progresses. For example, specific proteins, or biomarkers, that increase in the blood in humans following traumatic brain injury had increased expression in the samples from the horses with laminitis in this study. Medical doctors have used these compounds to understand the severity of these injuries in humans without using imaging or more invasive testing. Brooks hopes this could be used as a tool to monitor the progression of laminitis in the horse.

“We don't always recognize that a horse has severe laminitis until things have gotten quite bad,” said Brooks. “Early monitoring tools and ways to combat the disease were exciting findings, but we need further research before these new tools will be ready for use in the field.”

Brooks hopes that this research can lead to a blood test to detect these new laminitis-related biomarkers, and medications that are economical and effective for horses suffering from the disease.

“Ultimately, these new findings point us towards a more targeted approach for future exploration that we hope will help uncover novel solutions for preventing and treating this debilitating disease,” said Galantino-Homer.

“This is a big step in improving our understanding of laminitis,” said Brooks. “Something that could be completely untreatable ten years ago; in another ten years we may be able to intervene and make a significant difference in the disease early on.”

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