Your horse feels… off. The transitions are sticky, the canter depart feels like a negotiation, and there’s a new tension you can’t quite put your finger on. Is it a training issue? A behavioral quirk? Or is it pain?

For riders, this is one of the most confusing and frustrating crossroads. Two of the most common culprits for back-related issues, Kissing Spines and poor saddle fit, have symptoms that can look remarkably similar. A horse can’t tell you in words what’s wrong, leaving you to piece together the clues.

Before you jump to conclusions, it’s essential to become a careful observer. This checklist is designed to help you systematically evaluate your horse’s behavior and physical signs, empowering you to have a more informed conversation with your veterinarian and saddle expert.

The Great Overlap: Why These Symptoms Look So Similar

Both Kissing Spines and an ill-fitting saddle create pain and pressure in the horse’s back. This discomfort restricts the natural movement a horse needs to perform comfortably. As a result, the horse develops avoidance behaviors, which often manifest as:

• Reluctance to move forward or a “sluggish” feeling.
• Grumpiness when being groomed over the back or girthed up.
• Bucking, rearing, or bolting, especially during transitions.
• Difficulty bending or maintaining a consistent frame.
• An overall tense or hollow posture under saddle.

Because the horse’s response to pain is often the same regardless of the source, differentiating between a skeletal condition and an equipment problem requires a deeper look.

Understanding the Suspects: A Quick Primer

To spot the differences, it helps to understand what you’re looking for. Let’s break down the two main possibilities.

What is Kissing Spines (Dorsal Spinous Process Impingement)?

Kissing Spines is a condition where the bony projections coming off the top of the vertebrae (the spinous processes) are too close together. They may touch or “kiss,” causing inflammation, pain, and stiffness. In more severe cases, bone remodeling and cysts can occur.

While some horses are born with a predisposition, it can also be aggravated by factors like poor posture, weak core muscles, and work that encourages a hollow back.

How a Poorly Fitting Saddle Causes Pain

A saddle that doesn’t fit correctly is a constant source of irritation and restriction. Research by Dr. Sue Dyson has repeatedly shown a direct link between poor saddle fit and negative behaviors. The problem often comes down to a few key issues:

• Pressure Points: The saddle tree or panels dig into the horse’s muscles, creating sore spots and blocking blood flow.
• Bridging: The saddle only makes contact at the front and back, creating a “bridge” over the middle of the back and concentrating all the rider’s weight in two small areas.
• Restriction of Movement: The horse’s back needs to lift, flex, and bend. As Dr. Hilary M. Clayton’s work on equine biomechanics highlights, a restrictive saddle prevents this essential motion, forcing the horse into an unnatural, hollow frame.
• Excessive Length: This is a surprisingly common issue. At Iberosattel, we find that roughly 80% of horses we evaluate are ridden in saddles that are too long for their backs. A long saddle places pressure beyond the last rib, on the sensitive lumbar area, effectively shutting down the horse’s core and hind-end engagement.

The Rider’s At-Home Diagnostic Checklist

Disclaimer: This checklist is an observational tool to help you gather information. It is not a substitute for a professional diagnosis from a veterinarian, the only professional qualified to diagnose a condition like Kissing Spines.

Step 1: Observations from the Ground

Before you even think about tacking up, pay attention to your horse’s baseline behavior.

• Grooming & Palpation: Does your horse flinch, dip their back, or pin their ears when you curry their back muscles? Gently but firmly run your fingers down either side of their spine. Note any areas of tension, heat, or reactivity.
• Tacking Up: Is your horse fine until the saddle pad comes out? Do they get tense when the saddle is placed on their back, or do they react most strongly to the girth being tightened?
• Lunging (Without a Saddle): Watch your horse move freely on a lunge line. Do they move symmetrically? A 2015 study by Dr. W. Clayton found that 98% of horses showed “clear locomotion deficiencies” during lunging, indicating underlying asymmetries are incredibly common. Look for a shortened stride, difficulty picking up one canter lead, or a reluctance to stretch down.

Step 2: Under-Saddle Clues

Now, add the saddle and rider to the equation.

• Warm-Up: Does the resistance start immediately, or does it build as the work gets harder? Sometimes, saddle fit issues become more apparent as the horse’s muscles warm up and swell slightly.
• Transitions: Are upward transitions (like walk to trot or trot to canter) met with hesitation, a head toss, or a buck? These moments require the back to lift, which is painful if restricted.
• Bending and Circles: Does your horse struggle more on one rein than the other? Do they fall in or out on circles? This can indicate the saddle is pinching the shoulders or not allowing for proper lateral flexion.
• The Halt: When you ask for a halt, does your horse stop squarely, or do they park out with their hind legs trailing behind them? This can be a sign they are trying to relieve back pressure.

Step 3: Saddle and Equipment Check

Take a critical look at your primary piece of equipment.

• Saddle Placement: Are you placing the saddle correctly—behind the shoulder blade, not on top of it?
• Sweat Marks: After a ride, look at the sweat pattern under your saddle. Are there dry spots? Dry spots indicate either extreme pressure (blocking blood flow and sweat) or no contact at all (bridging).
• Saddle Length: Find your horse’s last rib and follow it up to the spine. Does your saddle’s support panel extend past this point? If so, it’s too long—a widespread problem that led to the development of modern solutions like short saddle panels.
• Balance: Place the saddle on your horse’s back without a pad or girth. Does it sit level, or does it tip forward or backward? Does it rock from front to back?

Your Path Forward: From Observation to Action

After going through this checklist, you should have a clearer picture. The goal isn’t to make a final diagnosis but to gather evidence.

1. Consult Your Veterinarian First: Your vet is your primary partner. They can perform a physical exam, take X-rays to confirm or rule out Kissing Spines, and provide a definitive medical diagnosis.
2. Involve a Qualified Saddle Expert: Whether your horse has Kissing Spines or not, a correctly fitting saddle is non-negotiable. A saddle that fits properly distributes weight evenly and allows the back to move freely, which is crucial for both rehabilitation and prevention.
3. Remember the Rider Factor: Research from Dr. Sue Dyson also points to the impact of rider-horse weight mismatch. A rider who is too heavy for the horse can cause back pain and lameness, even with a well-fitting saddle. It’s a sensitive topic, but a critical part of your horse’s overall comfort.

Ultimately, these issues are often connected. A poor saddle fit can exacerbate an underlying, low-grade Kissing Spines condition. Conversely, a horse with back pain may change its posture so much that a previously well-fitting saddle no longer works.

Frequently Asked Questions (FAQ)

Can a special saddle pad fix a bad saddle fit?

Think of a pad as a sock and a saddle as a shoe. If your shoe is too small, a thicker sock will only make it tighter. While shimmable pads can help with minor, temporary adjustments as a horse’s body changes, they cannot fix a saddle that is fundamentally the wrong size, shape, or length.

My horse was fine in this saddle for years. Why is it a problem now?

Horses are not static. Their bodies change throughout their lives due to age, diet, and workload. A saddle that fit your 5-year-old horse is unlikely to fit the same horse at age 10. Regular saddle fit checks (at least once or twice a year) are essential.

How do I know for sure if my saddle is too long?

The supportive panels of your saddle should not rest past the horse’s last rib (T18). Locate the last rib along your horse’s side and trace its path up toward the spine. Make a mark with chalk. Your saddle panel should end before this point.

The Foundation of Harmony is Comfort

Listening to your horse is the most important skill a rider can develop. When they act out, they are not being “bad”—they are communicating. By learning to recognize the subtle signs of discomfort, you can move from being a frustrated rider to a proactive partner in your horse’s well-being.

Understanding the why behind their behavior is the first step toward finding a solution. Whether the answer lies in veterinary care, a new saddle, or a combination of both, the journey starts with your commitment to putting their comfort first.