Why left-side horse mounting still matters in modern equine care
Bottom line
Mounting a horse from the left remains the standard in modern horsemanship, but the rationale has shifted from military tradition to consistency, safety, and horse welfare. PetMD’s recent explainer traces the custom to the era when riders carried swords on the left hip and mounted from the near side to avoid tangling the scabbard. Today, the practice persists largely because horses are commonly trained, led, and handled from the left, which can reduce surprise and improve predictability during mounting. At the same time, newer equine welfare discussions emphasize that always mounting from one side, especially from the ground, can create uneven pressure on the horse’s back and saddle. (ivis.org)
Why it matters: For veterinary professionals, this is less about tradition than about biomechanics and injury prevention. Equine handling guidance presented through AAEP-associated educational material describes left-side approach as the accepted norm for haltering and general interaction, reinforcing how deeply standardized left-side handling is in practice. But mounting mechanics matter: Equus reports that ground mounting can place markedly higher pressure on the horse’s back than using a mounting block or leg-up, with torque concentrated around the withers and trapezius region. That gives clinicians, rehab teams, and equine practitioners another opening to counsel riders on practical welfare measures, including consistent training, use of mounting blocks, and teaching horses to tolerate mounting from either side when appropriate. (ivis.org)
What to watch: Expect continued emphasis on mounting blocks, bilateral training, and rider education as equine welfare conversations move from tradition toward measurable back-health and handling outcomes. (equusmagazine.com)
The familiar rule to mount a horse from the left side is still widely taught, but current discussion around the practice is increasingly focused on welfare and safety rather than tradition alone. PetMD’s article revisits the custom’s historical roots while also highlighting modern best practices, including consistency for the horse, safer rider habits, and awareness of how mounting technique affects the horse’s body. (ivis.org)
Historically, left-side mounting is generally linked to military riding customs. Right-handed riders often wore swords on the left hip, making it easier and safer to mount from the horse’s left side without striking the animal or tangling equipment. Over time, that convention became embedded across riding disciplines, shaping everything from leading and haltering to saddling and mounting. AAEP-linked educational material and university horsemanship guidance still reflect that norm, describing left-side approach as standard procedure in basic horse handling. (ivis.org)
What’s changed is the framing. Modern equine educators are asking not just why riders mount from the left, but what repeated one-sided mounting does to the horse. Equus reports that mounting from the ground can exert substantially more pressure on the horse’s back than mounting from a block or receiving a leg-up, with forces that can twist the saddle and load the withers and adjacent musculature unevenly. The same reporting cites biomechanical concerns that the rider’s upward movement and one-stirrup loading can briefly place outsized force on the horse while also limiting the animal’s natural ability to rebalance. (equusmagazine.com)
There’s also a behavioral dimension. Reporting in The Horse on equine visual laterality suggests some horses prefer to keep people in their left field of view, which may help explain why left-side handling can feel more natural even in horses trained on both sides. At the same time, more recent welfare-oriented commentary argues that horses should be educated to accept handling and mounting from either side, particularly for trail settings, rehabilitation, or riders with physical limitations. (thehorse.com)
Industry commentary broadly supports a middle-ground view: keep left-side mounting as the default for consistency, but reduce strain and improve adaptability. Equus’ reporting includes biomechanical input from Jeff Thomason, PhD, and veterinary perspective from Joyce Harman, DVM, both pointing to the physical consequences of poor mounting technique and the benefits of lowering torque on the horse’s back. Separate coverage in The Horse has also noted that some horses show stress-related facial changes around the mounting block, suggesting that mounting behavior can become a welfare signal, not just a training issue. (equusmagazine.com)
Why it matters: For veterinary professionals, trainers, and practice teams, this topic sits at the intersection of behavior, musculoskeletal health, tack fit, and client education. Repeated asymmetrical loading may be relevant in horses with back pain, saddle-fit complaints, performance decline, resistance during mounting, or rehabilitation needs. Advising pet parents to use a mounting block, assess saddle stability, and train calm, bilateral handling can be a low-cost intervention that supports both welfare and safety. It also gives clinicians a practical way to connect subtle behavioral signs, such as stepping away, pinning ears, or tension at the block, with possible discomfort rather than dismissing them as disobedience. (equusmagazine.com)
What to watch: The next phase of this conversation is likely to center on more measurable links between mounting habits, back soreness, saddle movement, and behavior, along with wider adoption of mounting blocks and two-sided training as standard best practice in equine care and rider education. (equusmagazine.com)