Detecting lameness in your horse

Even the most attentive of us can miss the early signs of lameness. Subtle inconsistencies — a slight head nod, a shortened stride, a slight toe drag, or a reluctance to bend — are often brushed off as ‘just how the horse goes.’ But recognising the early signs of lameness is one of the most critical skills a horse owner can develop.

Lameness is defined as an abnormal gait or stance due to pain or mechanical dysfunction. It can be acute, dramatic, and obvious — but more often, it begins quietly. And the sooner it’s identified, the better the outcome for both treatment and long-term soundness.

Understanding lameness

Lameness doesn’t always equal pain. Some horses exhibit abnormal movement due to mechanical restrictions resulting from old injuries or conformational issues. But pain-related lameness is FAR more common, and almost always gets worse with time if left untreated.

According to the American Association of Equine Practitioners (AAEP), over 70% of lameness originates in the forelimbs, and most of it below the knee. Hindlimb lameness, however, is often harder to detect and may only show up under saddle or on specific surfaces.

What to look for

Here’s what to look out for both in-hand, on the lunge, and under saddle:

In-hand (walk and trot, straight line)

• Head nodding: A classic indicator of front limb lameness.

“The head goes up when the lame leg bears weight, and down when the sound leg lands” — a helpful vet school mantra.

• Hip hike or drop: Often seen in hindlimb lameness. The pelvis may rise abnormally on one side as the horse tries to reduce pressure.
• Shortened stride or toe dragging: One leg moves less fluidly or doesn’t track up.
• Asymmetrical rhythm: Even on hard ground, the trot should sound like a steady 1-2-1-2. Uneven beats often suggest pain.
• Reluctance to turn tightly or move in-hand: Subtle resistance during groundwork can be an early sign.

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Top tip

Film your horse in motion regularly — straight lines, circles, and both directions. Even better, get footage under saddle if you suspect something is ‘off.’ Subclinical lameness often only emerges in the context of weight-bearing or collection. These videos can be used over time to spot subtle changes and help identify when something needs attention.

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On the lunge

Lunging can exaggerate asymmetries, which can be helpful in identifying a mild lameness. On a circle:

• A horse with inside hindlimb lameness may drift out, shorten the inside step, or swing the quarters outward.
• A horse with outside forelimb pain may struggle to maintain rhythm, or nod more visibly as the circle stresses that limb.

Under saddle

Many horses appear sound in-hand and on the lunge, but under saddle, the picture can change completely.

More obvious signs of lameness under saddle that are often detected by riders themselves include:

• Irregularities in stride
• Difficulty picking up or maintaining a canter lead
• Heavy contact on one rein only
• Reluctance to bend or work on one diagonal
• Changing head position, tail swishing, or pinning ears under pressure
• Tripping, especially on one leg
• Refusing jumps or reluctance to perform collected movements

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Don’t discredit what you feel

Sometimes, it’s not what you see but what you feel. That elusive sensation of your horse being a little hollow, disunited, or ‘not taking you forward’ is worth investigating. Even vague, non-specific issues, such as a lack of impulsion, crookedness, or girthiness, can point to musculoskeletal discomfort.

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On the other hand, more subtle behavioural signs may be dismissed as resistance, laziness, or tension, when in fact they reflect discomfort or pain.

To help riders and professionals recognise these signs, Dr Sue Dyson and her research team developed the Ridden Horse Pain Ethogram (RHPE) — a structured assessment tool consisting of 24 specific behaviours that correlate with musculoskeletal pain. These are identified by observers on the ground while the horse is ridden.

These are:

1. Repeated changes in head position (up/down or side to side)
2. Head tilted or twisted
3. Head consistently behind the vertical (>10° for ≥10 seconds)
4. Head in front of the vertical (>30° for ≥10 seconds)
5. Opening the mouth repeatedly and for ≥10 seconds
6. Tongue exposed or hanging out
7. Ears rotated back behind vertical or flat for ≥5 seconds
8. Sclera (white of eye) exposed for ≥5 seconds
9. Intense stare for ≥5 seconds
10. Repeated tail swishing (not fly-related)
11. Spontaneous changes of gait (e.g. breaking into trot or canter unexpectedly)
12. Spontaneous changes in speed within a gait
13. Reluctance to move forward
14. Backing up spontaneously or with minimal rein cue
15. Toe dragging (especially forelimbs)
16. Stumbling or tripping repeatedly
17. Dragging the hindlimbs or failure to track up
18. Hindlimbs not following the path of the forelimbs (crookedness)
19. Cantering with a 4-beat rhythm (disunited or irregular)
20. Cantering with repeated interruptions or poor transitions
21. Swishing the tail repeatedly in transitions
22. Bucking, rearing, or kicking out
23. Reluctance or refusal to canter
24. Holding the mouth tightly closed, with a tense jaw and lips

If a horse displays 8 or more of these 24 behaviours, he is highly likely to be experiencing pain under saddle.

“The ethogram gives us a structured way to recognise what pain looks like in ridden horses,” says Dr Dyson. “It removes the guesswork and helps horses get help sooner.”

The RHPE has been validated in multiple peer-reviewed studies, and its application is growing in both clinical and competition settings. It empowers owners to become more observant — not just of lameness, but of subtle signs that a horse may be struggling long before limping becomes visible.

Subtle clues – when it’s about more than movement

Not all signs of lameness are visible in the gait. Some horses express discomfort through changes in behaviour, posture, or body language well before an uneven stride appears.

These more general indicators include girthiness, flinching when groomed, or sudden resistance when being tacked up. Horses may also show inconsistent or patchy sweating, particularly if one side of the body stays dry during work. A change in demeanour — becoming withdrawn, unusually reactive, or ‘cold backed’ — may also point to musculoskeletal pain. Even a decline in performance, reluctance to be caught in the paddock, or avoidance during mounting can signal discomfort.

These signs are easy to dismiss, but when viewed in context with physical assessment or under-saddle behaviour, they often point toward something deeper.

The key is to know what’s normal for your horse, and notice when something changes.

What to do if you suspect lameness

1. Stop pushing through. Many injuries become more serious when training continues.
2. Document what you see. Take videos, make notes, and notice patterns.
3. Call your vet. Even if it feels minor, early intervention makes all the difference.
4. Avoid masking symptoms.Don’t reach for anti-inflammatories until a diagnosis is made.
5. Review your saddle fit. This is a frequent contributor to uneven movement.

Know your normal

Every horse moves differently, but every horse moves consistently when sound. One of the best things you can do during your ‘Mid-Year Reset’ is to become an expert in how your horse looks and feels at their best, even when at rest. That way, you’ll notice the small changes before they become big ones.