Of all the checks a horse owner can carry out at home between professional saddle fitting appointments, assessing the clearance at the withers is perhaps the most important and the most immediately informative. The withers is one of the most sensitive and most vulnerable areas of the horse’s body in relation to saddle fit, and a saddle that is pressing on or sitting too close to the withers is causing discomfort and potentially lasting damage — regardless of how well it may be fitting in other respects.

The good news is that assessing wither clearance is one of the more straightforward home checks a rider can carry out, and with a little knowledge and a careful eye it can be done quickly and reliably as part of a regular saddle monitoring routine.

Why wither clearance matters

The withers is a complex structure of bone, cartilage, ligament, and muscle — the spinous processes of the thoracic vertebrae extend upward to form the characteristic ridge, and this area is covered by relatively little protective tissue compared to the broader areas of the back on either side. Pressure from the saddle in the wither area is therefore transmitted relatively directly onto sensitive structures, with limited ability to absorb or distribute it.

The consequences of a saddle that presses on or sits too close to the withers include direct pressure on the spinous processes causing pain, bruising, and in more serious or longstanding cases lasting bony changes and soft tissue damage; restriction of the horse’s shoulder movement, since the shoulder blade sweeps backward and upward during movement and a saddle sitting too close to the withers at the front will interfere with this; muscle tension and soreness through the shoulder, neck, and back as the horse braces in response to discomfort; behavioural changes including reluctance to go forward and resistance to being tacked up; and in more severe cases the development of wither pressure sores — open wounds or areas of hair loss and tissue damage that develop as a direct result of sustained pressure.

What affects wither clearance

The width of the saddle tree is the primary determinant. A tree that is too narrow will sit too high and close on the withers, creating direct pressure. A tree that is too wide will sit too low, allowing the pommel arch to drop down toward the withers and potentially making contact under the rider’s weight.

The shape and angle of the tree head must match the individual horse’s wither profile and shoulder angle — a mismatch can create uneven pressure on one or both sides even when the overall width appears approximately correct. Changes in the horse’s condition — weight gain or loss, muscle development or loss, seasonal changes — can all affect the height of the withers relative to the surrounding back musculature and therefore change the clearance available. The fit of the saddle panels matters too: if panels are overfilled, underfilled, or unevenly filled, this can tilt the saddle in ways that affect wither clearance even if the tree itself is the correct width. And a thick or poorly fitted numnah can reduce the available clearance by adding bulk beneath the pommel arch.

What you’ll need

• Your saddle — clean and in its normal condition
• Your usual numnah or saddle pad if you use one — you will carry out some checks with and some without it
• A level, well-lit area in which to work
• A helper if possible — some elements of the assessment are easier with two people
• Your fingers — the primary tool for most of the checks described here

Before you begin

Ensure your horse is standing squarely on a level surface — an uneven surface or a horse standing with weight unevenly distributed will give you an inaccurate picture. Allow your horse to stand quietly for a few minutes before carrying out the assessment. Carry out all checks on both sides — wither clearance can differ between the near and off side, particularly in horses with natural asymmetry.

Step 1 — Visual assessment without a numnah, ungirthed

Place the saddle on your horse’s back without a numnah, in its correct position, without girthing it up. Allowing the saddle to sit in its natural resting position without the influence of the girth gives you a baseline picture of how the tree is fitting at the withers.

Stand directly in front of the horse and look at the saddle from the front. You should be able to see a clear and open channel running the full length of the saddle from front to back, with the pommel arch sitting above and clear of the withers. Look at the gap between the lowest point of the pommel arch and the highest point of the withers — this gap should be clearly visible and appear generous rather than tight. Check from both sides too. A saddle that appears to be sitting very close to the withers at this stage — without a girth and without a rider’s weight — is likely to be making contact under the pressure of girthing and riding, and should be assessed professionally before being used.

Step 2 — Finger check without a numnah, ungirthed

With the saddle in its correct resting position and without a girth, stand at the side of the horse and slide your fingers vertically into the space between the pommel arch and the horse’s withers, fingers pointing downward. Count how many fingers you can comfortably fit in the space.

As a general guideline, you should be able to fit a minimum of two to three fingers upright in this space when the saddle is ungirthed. More than three fingers of clearance is not necessarily a problem — some horses and some saddle designs will have more as a natural result of their conformation and the saddle’s design. The concern is when clearance is less than two fingers, as this indicates that the tree may be too narrow or the saddle sitting too close to the withers. Repeat on both sides and note any significant difference between near and off side.

Step 3 — Finger check without a numnah, girthed

Girth the saddle up to its normal working tension and repeat the finger check. Note how the clearance has changed compared to the ungirthed check — it is normal for clearance to reduce slightly when the saddle is girthed up, as the girth draws the saddle downward against the horse’s back. There should still be a minimum of two fingers of clearance when girthed. If the clearance has reduced to less than two fingers, or if any part of the pommel arch is making contact with the withers, this requires professional assessment before the saddle is used. Check both sides.

Step 4 — Assessing clearance with a rider’s weight

This is the most critical check of all, because this is the condition in which the saddle will spend the majority of its working life, and the condition in which insufficient clearance is most likely to cause harm.

With the saddle girthed at normal working tension, ask your helper to mount and sit in their normal riding position — balanced and relaxed in the deepest part of the seat. Stand at the front of the horse and observe the clearance between the pommel arch and the withers. There must be a clear and visible gap — any contact between the saddle and the withers with the rider mounted is unacceptable and requires immediate professional attention.

Ask your helper to carry out a few transitions — walk to halt, halt to walk — whilst you observe from the front. Transitions create moments of increased downward pressure in the saddle and are one of the most revealing tests of whether clearance is genuinely adequate. As a general guideline, there should be a minimum of two fingers of clearance with the rider in a normal seated position; some fitting authorities use three fingers as their minimum with a rider mounted, reflecting the additional pressure that weight places through the front of the saddle. Observe from both sides.

Step 5 — Assessing clearance with your numnah

Place your usual numnah on the horse’s back and position the saddle on top, ensuring the front of the numnah has been pulled up into the channel of the saddle to prevent it from pressing down on the spine. Carry out the same finger checks — with and without the girth — and compare the clearance with the numnah to the clearance without it.

A thick, rigid, or memory foam numnah can reduce wither clearance more significantly than a thinner, more flexible option, and for horses with borderline wither clearance this can tip an acceptable fit into an unacceptable one. If your numnah is noticeably reducing clearance, consider switching to a thinner, more flexible option and discuss the findings with your fitter at your next appointment.

Step 6 — Checking the wither channel clearance

In addition to the clearance above the withers, check that the channel of the saddle is providing adequate clearance over the horse’s spine throughout its full length.

With the saddle correctly positioned and girthed, look at the saddle from directly behind the horse. You should be able to see a clear channel of light running the full length of the saddle from front to back. The channel should appear even and consistent in width throughout — a channel that narrows significantly at any point, or that appears to close at the front or rear of the saddle, is worth noting and discussing with your fitter. Run your hand carefully along the channel from the back of the saddle toward the front, feeling for any points at which the panels appear to be pressing toward the spine.

Step 7 — Post-ride wither assessment

After your ride, take a few moments to carry out a post-ride assessment — this can provide important additional information about how the saddle has been fitting during the session.

Remove the saddle and numnah and immediately run your hands gently but firmly over the wither area, feeling for any areas of heat, sensitivity, or muscle tension that were not present before you rode. A horse that reacts to pressure over the wither area after riding — flinching, moving away, or showing sensitivity when the area is touched — may be experiencing pressure from the saddle. Look carefully for any signs of ruffled hair, pressure marks, or areas of hair loss. Observe the sweat pattern: a dry patch directly over the wither, surrounded by sweating areas on either side, can indicate that the saddle is pressing on the wither and preventing normal sweating in that area. Note any changes and report them to your fitter — patterns of post-ride sensitivity that develop consistently over time are important diagnostic information.

Signs your wither clearance may be insufficient

• Less than two fingers of clearance between the pommel arch and the withers when the saddle is ungirthed
• Less than two to three fingers of clearance when the saddle is girthed up
• Any contact between the pommel arch and the withers with a rider mounted
• The channel of the saddle appearing to close or narrow significantly at the front
• Post-ride sensitivity or heat over the wither area
• Ruffled hair, pressure marks, or hair loss at the withers
• Dry patches directly over the wither in the sweat pattern after riding
• Reluctance to go forward, resistance to being tacked up, or sensitivity when the saddle area is touched
• Restriction through the shoulder or tightness through the back and neck
• The saddle shifting or rocking during riding

If any of these apply, stop riding in the saddle and seek professional assessment promptly. Continuing to ride a horse in a saddle with insufficient wither clearance will cause progressive discomfort and potentially lasting damage — and the longer the problem persists, the more complex the rehabilitation process is likely to be.

For horses fitted with a WOW saddle, insufficient wither clearance may indicate that the head plate needs to be changed or that the Flair panels need adjustment — both of which can be carried out by a qualified WOW fitter without the need to replace the saddle.

Key takeaways

✔ You should be able to fit a minimum of two to three fingers upright between the pommel arch and the withers when the saddle is ungirthed — and a minimum of two fingers when girthed

✔ There must always be a clear and visible gap between the pommel arch and the withers with a rider mounted — any contact at all is unacceptable

✔ Clearance must be checked on both sides — asymmetry between the near and off side is worth noting and reporting to your fitter

✔ A thick numnah can tip borderline clearance into an unacceptable fit — always check clearance with your usual numnah in place

✔ Post-ride heat, sensitivity, ruffled hair, or an unusual sweat pattern at the wither are all signs to take seriously

✔ If you have any concerns, stop riding in the saddle and seek professional assessment — don’t wait for the next routine appointment

Concerned about your saddle’s wither clearance?

If any of these checks have raised concerns, or if it’s been a while since your saddle was professionally assessed, get in touch to book a fitting.

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Further reading

• Why a correctly fitting saddle is critical
• Signs your saddle doesn’t fit
• How to check your WOW saddle’s Flair panels between fittings
• The WOW saddle investment