30/10/2026
Let’s talk about spinal clearance.
It’s one of those things that seems pretty self-explanatory in theory, of course we want to keep the saddle off the spine!
But unfortunately it is a shockingly common fit issue I come across in the field.
When a gullet channel is too narrow, it causes your horse to drop away from the pressure. You lose carriage over the back, which negatively affects posture and movement quality, ultimately putting more strain on the legs and placing the horse at a higher risk of injury.
It’s always a big chain reaction when one part of the horse–saddle–rider system doesn't work well.
So, how do we provide sufficient clearance?
We naturally want to stay off the vertebrae, the bone itself, but we also need to stay completely clear of the dorsal ligament system, the non-weight-bearing multifidus muscle, and the sensitive spinal nerves. The distal end of the vertebrae contains openings for these spinal nerves, making it crucial that the channel is wide enough from front to back to avoid impinging them.
If you trace a line right along your horse's spine from the 18th thoracic vertebra to the withers with gentle pressure with your fingers, you’ll likely notice a muscle reaction and a subtle flicking of the skin.
This is a reflex action triggered by pressure on those spinal nerves.
When a saddle applies weight here, the horse reflexively drops their back to escape the discomfort, triggering a chain reaction that locks their shoulders and rotates their pelvis.
We also have to keep in mind that the horse’s spine moves in three planes that must be accommodated by your saddle’s gullet channel, which is where dynamic saddle fitting comes in:
- The Sagittal Plane (Up and Down): When your horse collects and lifts their core, their spine physically rises, if the saddle allows it to!
- The Frontal Plane (Side to Side): During a 20-meter circle or lateral work, the vertebrae swing left and right toward the inner edges of the saddle panels, requiring adequate lateral clearance.
- The Transverse Plane (Twisting): As your horse's barrel swings in motion, the vertebrae naturally rotate and tilt. Again, this is a motion the saddle needs to accommodate to allow the horse to move freely.
Here’s the catch, though, wider isn’t always better!
If your gullet channel is too wide for your horse, the panels may collapse onto the spine once your weight is in the saddle, completely defeating the purpose of your gullet channel.
The goal is always to find the exact space your individual horse needs to flex, bend, and rotate comfortably. Spinal width varies tremendously from horse to horse, so evaluating what your horse actually needs, and how your saddle interacts with them in motion, is essential.
If you’re unsure what you’re seeing, or if your horse is showing defensive behaviours under saddle, it may be time for a check-in.
Feel free to reach out via DM or email at [email protected] to get started.
I’d love to hear from you. Happy riding!