Hoof Imbalance or Saddle Fit? When Different Problems Produce Similar Symptoms
Part 4 of a six-part series exploring hoof balance, saddle fit, and the whole-horse, whole-rider approach.
Have you ever noticed a horse shortening its stride, struggling with transitions, or finding one direction considerably more difficult than the other? Perhaps the horse has begun resisting the rider's leg, hollowing its back, or moving with an uneven rhythm. These are all things that might lead an owner to question whether the saddle fits correctly.
And sometimes the saddle is contributing to the problem. But what if the same difficulties could also be associated with the way the horse's hooves are functioning?
This is where I think things become particularly interesting. We often associate certain behaviors or movement difficulties with a particular problem, yet the same outward response can arise from quite different mechanical influences. A horse that shortens its stride because of discomfort in a foot may look surprisingly similar to one that shortens its stride because of uncomfortable saddle pressure. And in some cases, the two problems may be contributing to one another.
I'd like to look at several types of hoof imbalance, what we know about their biomechanical effects, and how those effects might resemble difficulties we commonly associate with saddle fit.
Long Toes and the Mechanics of Breakover
Let's begin with toe length, because breakover is such an important part of how a horse moves.
Breakover occurs during the final portion of the stance phase, as the heel lifts and the hoof rotates over the toe before leaving the ground. The location of the breakover point influences the lever arm acting on the distal limb, and excessive toe length can increase the mechanical demands involved in this movement.
Consider what happens when the toe extends farther forward than is appropriate for the individual hoof. The horse must negotiate that additional leverage as the foot leaves the ground. Depending on the horse's conformation and other aspects of hoof mechanics, this can influence the forces acting on the distal interphalangeal joint, the deep digital flexor tendon, and associated structures.
The deep digital flexor tendon runs down the back of the limb, passes over the navicular region, and inserts on the underside of the coffin bone. Its mechanical relationship with the coffin joint changes throughout the stride, making hoof geometry and breakover relevant to the loading of these structures.
This doesn't mean every horse with a long toe will become lame or shorten its stride. It does mean that toe length deserves consideration when evaluating altered limb mechanics.
Now imagine a horse that has begun shortening its stride, moving reluctantly, or resisting transitions. Those difficulties might be associated with discomfort or altered mechanics in the foot, but they can also occur when a saddle creates uncomfortable pressure or interferes with movement.
The symptoms alone won't tell us which explanation is correct. We need to examine what is happening at both ends of the horse.
Low Heels, Underrun Heels, and Hoof-Pastern Alignment
Low heels and underrun heels are often discussed together, but they aren't necessarily the same thing. A hoof may have a relatively low heel without the heel tubules being markedly displaced forward, while underrun heels involve a distortion in which the heel structures have migrated forward relative to their expected position.
These distinctions matter because we're interested in how the hoof supports and loads the internal structures, not simply how high the heel appears from the outside.
In horses with a long-toe, low-heel conformation, the hoof-pastern axis may appear broken backward. The orientation of the coffin bone within the hoof capsule may also be altered, although external appearance alone cannot reliably establish its position.
A low or negative palmar or plantar angle is particularly important to recognize. This refers to the orientation of the solar margin of the coffin bone relative to the ground and requires appropriate radiographs to assess accurately.
Changes in hoof-pastern alignment and coffin bone orientation can alter mechanical relationships within the distal limb. Depending on the individual horse, those changes may influence tendon loading, joint mechanics, and the way the limb functions during movement.
But here's where I believe we need to be careful. It would be tempting to say that a particular heel configuration causes a particular shoulder or back restriction. The research doesn't establish such a predictable relationship.
What we can reasonably investigate is whether altered hoof mechanics are contributing to discomfort or movement changes that may subsequently influence how the horse uses the rest of its body.
A horse that becomes reluctant to move forward, struggles to maintain rhythm, or changes its stride may also display those behaviors when experiencing discomfort beneath a saddle. Unless we examine the horse's movement and the possible sources of discomfort, we risk assuming that the most obvious explanation is the correct one.
Mediolateral Imbalance and Uneven Limb Loading
Mediolateral hoof balance concerns the relationship between the inner and outer sides of the hoof and how they function under load.
It's often discussed in terms of one side being higher than the other, but functional mediolateral balance is considerably more complicated than making both hoof walls the same length.
Limb conformation, joint alignment, hoof capsule distortion, and the way the horse loads the foot all influence what we observe. A horse with naturally asymmetrical limb conformation may not benefit from having its hoof trimmed to an externally symmetrical shape.
When the medial and lateral sides of the hoof experience different loading patterns, the distribution and direction of forces acting through the distal limb can change. These forces influence the mechanical environment of the joints, collateral ligaments, and other supporting structures.
But uneven loading doesn't automatically mean that the hoof has been incorrectly trimmed. Some differences are associated with the horse's individual conformation or habitual movement.
This is why I consider it important to examine the hoof both standing and in motion, and to consider radiographic information when necessary.
Now think about a horse that consistently struggles more in one direction. Perhaps it has difficulty maintaining a bend, tends to drift through one shoulder, or feels uneven beneath the rider.
Could altered mediolateral hoof mechanics be contributing? Possibly. But similar difficulties can arise from pain elsewhere in the limb, restrictions through the horse's body, training issues, rider asymmetry, or saddle pressure.
A saddle that loads unevenly may influence how the horse uses its back. Conversely, a horse moving asymmetrically may influence how the saddle is loaded.
The important question isn't simply whether the hoof looks level or the saddle looks straight. It's whether the mechanical relationships we're observing are contributing to the horse's difficulty.
High-Low Forefeet and Asymmetrical Movement
Some horses develop noticeably different front feet, with one more upright and the other flatter or lower in angle. These are commonly described as high-low or mismatched forefeet.
It's easy to assume that one foot must be incorrect and that the solution is to make the two feet look alike. But that assumption can lead us in the wrong direction.
Differences in hoof shape may be associated with limb conformation, habitual posture, uneven loading, previous injury, discomfort, or hoof-care history. A horse may also develop a preference for placing one front limb farther forward when grazing or standing, potentially influencing how the two feet develop over time.
Research by Wiggers and colleagues examined the functional consequences of uneven forefeet in riding horses. Their findings demonstrated that differences in hoof conformation can be associated with measurable differences in limb loading and movement.
This is significant because those differences may exist even when the horse isn't displaying obvious clinical lameness.
But there's an important question we shouldn't overlook. Did the different hoof shapes contribute to the movement asymmetry, or did the horse's habitual movement and loading patterns contribute to the different hoof shapes?
The relationship may work in both directions.
From a saddle-fitting perspective, I'm interested in what happens when those differences are accompanied by asymmetrical movement through the horse's body. A rider may notice that one shoulder feels different, that one direction is easier to ride, or that the saddle seems less stable.
Those observations warrant investigation, but they don't establish that the mismatched feet are responsible.
Nor should we assume that forcing the two feet toward identical angles will improve the horse's movement. Functional balance must respect the individual horse's anatomy, and abrupt changes can create problems of their own.
Hind Hoof Balance, Pelvic Movement, and Saddle Stability
The hind feet are particularly interesting because the hind limbs contribute to propulsion, support, balance, and the coordination of movement through the pelvis and trunk.
As with the front feet, hind-hoof conformation influences the mechanical relationships within the distal limb. Toe length, heel support, hoof-pastern alignment, and mediolateral loading are all worth considering when evaluating how the hind limbs function.
A horse with discomfort or altered mechanics in a hind foot may change how it loads or moves that limb. Depending on the circumstances, those adaptations may influence pelvic movement and the coordination of the trunk.
However, we don't yet have sufficient direct research to claim that a particular hind-hoof imbalance reliably produces a particular pelvic restriction, back asymmetry, or pattern of saddle slip.
What we do have is compelling evidence that hindlimb lameness can influence saddle stability.
In a study involving 128 horses, Greve and Dyson found that consistent saddle slip occurred in 38 of 71 horses with hindlimb lameness. When diagnostic analgesia temporarily abolished the lameness, the saddle slip disappeared in 37 of those 38 horses.
Think about that for a moment. The saddle itself hadn't been changed, yet eliminating the lameness changed how it behaved.
In most affected horses, the saddle slipped toward the side of the more lame hindlimb. This finding is particularly useful because it demonstrates that an apparent saddle-fitting problem may be associated with a movement abnormality originating elsewhere in the horse.
It doesn't prove that hind-hoof imbalance causes saddle slip, and it certainly doesn't mean that every slipping saddle indicates hindlimb lameness. But it does show why persistent saddle displacement should prompt us to investigate the horse's movement rather than repeatedly adjusting the saddle without understanding what is happening.
If a horse consistently slips its saddle to one side, particularly when accompanied by movement asymmetry, veterinary assessment is an important consideration.
What About Restrictions Within the Horse's Body?
There's another part of this discussion that I don't want to overlook: the restrictions that may already exist within the horse's body.
Muscular tension, reduced joint mobility, pain, previous injuries, and compensatory movement patterns can all influence how the horse stands, moves, and uses its back. These restrictions may contribute directly to saddle-fitting difficulties, independently of hoof balance.
A horse with restrictions through its shoulders, thoracic region, back, or pelvis may have difficulty moving freely or symmetrically. That can influence how the saddle contacts and moves with the horse, as well as how the rider experiences the movement beneath them.
Appropriate bodywork, rehabilitation, veterinary care, and exercise can be important in addressing these difficulties.
But suppose the horse has developed a restriction partly in response to altered hoof mechanics. Releasing the restriction may improve mobility and comfort, yet the horse may continue experiencing the same mechanical demands if the contributing hoof problem remains unchanged.
Might those demands encourage the compensation to return?
I believe this is an important possibility to investigate, particularly in horses whose restrictions repeatedly return despite treatment.
The reverse is equally important. Improving hoof function doesn't automatically resolve established muscular restrictions, pain, or habitual movement patterns. Those may still require attention before the horse can take full advantage of the mechanical changes.
This is why I consider functional hoof balance an important foundation while recognizing that the hooves are only one part of the horse's overall function.
And Then There's the Rider
We also need to consider the person sitting on the horse.
A rider may have restricted movement through one hip, a tendency to collapse through the waist, pelvic asymmetry, or difficulty maintaining independent balance. These factors can influence how the saddle is loaded and how the horse moves beneath it.
Equally, the rider may be compensating for something happening in the horse.
If the horse moves differently from one direction to the other, the rider may begin shifting their weight or altering their posture to accommodate that movement. Over time, these adjustments may become habitual.
Research by Gunst and colleagues involving 80 horse-rider pairs demonstrated that both horse and rider asymmetries influenced saddle force distribution.
So when a rider feels crooked or consistently loads one stirrup differently, I don't want to assume that the rider simply needs to correct their position. I want to understand what is influencing that position.
Is the rider compensating for the horse? Is the horse responding to the rider? Is the saddle contributing? Or are several factors interacting?
The answers may be quite different from what we initially expect.
How Do We Distinguish Between the Possible Causes?
This is where careful observation becomes essential.
If a horse shortens its stride, resists bending, struggles with transitions, or develops an uneven rhythm, I want to understand how it moves before the saddle and rider are introduced.
Does the asymmetry appear when the horse is moving freely or being led? Does it change with speed, direction, or footing? Are there signs of discomfort? What do the hooves tell us about conformation, loading, and possible distortion?
I also want to consider restrictions within the horse's body and how those restrictions may influence movement.
Then we can examine what changes when the saddle is introduced and again when the rider gets on.
A saddle that creates focal pressure or restricts movement may contribute to discomfort that wasn't apparent without it. A rider's physical asymmetry may alter how the saddle is loaded. Conversely, the horse may already be moving asymmetrically before either the saddle or rider is involved.
These observations help us identify where further investigation is needed, although they don't necessarily establish a diagnosis.
Persistent movement asymmetry, pain, or suspected lameness deserves appropriate veterinary evaluation. Hoof radiographs, objective gait analysis, and other diagnostic tools may be valuable when the findings warrant them.
And we must remember that more than one problem can exist at the same time. A horse may have uncomfortable hoof mechanics, restrictions through its body, and a saddle that genuinely doesn't fit.
Addressing only one of those factors may not produce the improvement we're hoping for.
Why the Distinction Matters
I believe one of the greatest challenges in working with horses is resisting the temptation to assume that the most obvious symptom identifies the source of the problem.
A horse that shortens its stride may be responding to discomfort in a foot, restrictions through its body, saddle pressure, or something else entirely. A rider who struggles to sit evenly may have physical restrictions of their own, or may be compensating for the horse's movement.
And a saddle that slips may be incorrectly fitted, but it may also be responding to a movement abnormality originating elsewhere.
These possibilities aren't interchangeable, and the appropriate intervention depends on understanding what's actually contributing.
Changing a saddle won't necessarily resolve altered hoof mechanics. Improving hoof balance won't correct a saddle that creates uncomfortable pressure. And neither intervention automatically resolves established restrictions within the horse's body or the rider.
My approach is to examine the relationships between these factors rather than treating any one of them as the complete explanation.
Sometimes the findings are straightforward. Other times, they require considerable investigation and collaboration between the professionals involved.
What matters is that we're willing to look beyond the obvious and question our assumptions before deciding what needs to change.
Because the same outward symptom can have very different causes, and understanding those differences may be the key to helping the horse and rider move forward comfortably.
Research and Further Reading
1. Wiggers, N., et al. (2015). Functional Locomotor Consequences of Uneven Forefeet for Trot Symmetry in Individual Riding Horses. PLOS ONE, 10(2), e0114836.
2. Faramarzi, B., Nguyen, A., & Dong, F. (2018). Changes in hoof kinetics and kinematics at walk in response to hoof trimming: pressure plate assessment. Journal of Veterinary Science, 19(4), 557–562.
3. Greve, L., & Dyson, S. J. (2013). An investigation of the relationship between hindlimb lameness and saddle slip. Equine Veterinary Journal, 45(5), 570–577.
4. Gunst, S., et al. (2019). Influence of Functional Rider and Horse Asymmetries on Saddle Force Distribution During Stance and in Sitting Trot. Journal of Equine Veterinary Science, 78, 20–28.
5. Moorman, V. J. (2024). Hoof Imbalance in Horses. Merck Veterinary Manual.
6. Greve, L., & Dyson, S. (2013). The horse–saddle–rider interaction. The Veterinary Journal, 195(3), 275–281.
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