Jockeys can cause horses discomfort, but the degree of harm depends on several factors: how the whip is used, how much weight the horse carries, and how the jockey rides. Modern racing has introduced regulations and equipment changes specifically to reduce the physical toll on horses, though critics argue these measures don’t go far enough.
How Jockey Weight Affects the Horse
Horses don’t show measurable changes in their gait or energy expenditure until the rider’s weight exceeds 20 to 25 percent of the horse’s body weight. A typical Thoroughbred racehorse weighs around 1,000 to 1,200 pounds, while a jockey plus equipment usually comes in at 126 pounds or less. That puts the weight ratio well under 15 percent, comfortably below the threshold where biomechanical stress becomes a concern.
What matters almost as much as weight is how the jockey sits. The modern crouched jockey position, developed in the early 20th century, significantly reduces the workload on the horse. Research from the Royal Veterinary College found that a crouched jockey essentially uncouples from the horse’s stride cycle. Instead of the horse having to accelerate the rider’s body through each stride, it only has to support the jockey’s static weight. A seated rider, by contrast, forces the horse to absorb and move additional mass with every stride. This elastic coupling between a crouched jockey and horse is one reason race times improved dramatically after jockeys adopted the forward seat.
The Whip Question
This is where the debate gets sharpest. Racing jurisdictions have moved to padded whips (sometimes called cushion whips), which leave a shallower impression on impact compared to traditional designs. But “less painful” is not the same as “pain-free.” No published research has confirmed that padded whips eliminate pain. One analysis found that strikes where the unpadded section of the whip contacts the horse are actually more common than clean hits with only the padded tip, undermining the argument that the redesign solves the problem.
In the United States, the Horseracing Integrity and Safety Authority (HISA) limits jockeys to six strikes per race on the hindquarters, delivered in bursts of two or fewer with at least two strides between uses. Jockeys cannot raise the whip above helmet height, strike the horse after it has reached its best possible finishing position, or keep striking a horse that isn’t responding. The whip itself must weigh no more than eight ounces, be no longer than 30 inches, and end in a smooth foam cylinder. Violations are categorized by severity: one to three extra strikes is a Class 3 violation, four to nine extra is Class 2, and ten or more is Class 1, each carrying escalating suspensions and fines.
British racing has similar controls, with veterinary officers on course to check horses before and after every race. At the 2024 Cheltenham Festival, nine vets, three veterinary nurses, and six horse ambulances were stationed on site. Every runner was examined by a vet before competing. Still, welfare advocates point out that enforcement after the fact doesn’t prevent the initial pain a horse feels during the race.
Stress Beyond the Whip
Racing itself places significant physiological stress on horses, regardless of what the jockey does. Cortisol, the body’s primary stress hormone, spikes immediately after a race. Research on Thoroughbred racehorses found elevated cortisol levels in blood samples collected right after racing compared to samples taken during rest or training. At the same time, the horses’ immune function dipped: the percentage and intensity of phagocytosis (the process by which immune cells destroy pathogens) dropped immediately post-race, and oxidative burst activity, another measure of immune readiness, also declined. These changes were temporary, but they show that racing pushes horses into a state of acute physiological stress comparable to intense athletic competition in any species.
Long-Term Bone and Joint Damage
The cumulative effect of carrying a jockey at high speed over months and years poses a more serious risk than any single race. Stress fractures are the most common cause of fatalities in horse racing. Horses trained at higher intensity in the two to twelve months before death, and those kept in training for extended periods without a break, face increased fracture risk. Paradoxically, the one to two months after returning from a layoff are also a high-risk window, because bone that has partially remodeled during rest is temporarily weaker when loading resumes.
The mechanism works like this: intense, repeated loading creates microscopic damage in bone tissue, particularly in the lower leg bones and the small sesamoid bones near the fetlock. The body responds by resorbing damaged bone and depositing new tissue. But if the horse keeps training at the same intensity during that repair window, the weakened bone accumulates more microdamage faster than it can heal. This creates a destructive cycle where small lesions, characterized by low bone density and high levels of microdamage, progress toward a clinically significant fracture. Researchers have found that bone near fatigue fracture sites in active racehorses shows elevated remodeling activity compared to controls, confirming that the damage-repair cycle can spiral when rest is insufficient.
How Horses Show Pain
Horses can’t report discomfort, so researchers have developed behavioral tools to detect it. The Horse Grimace Scale identifies pain through facial expressions. Broader ethograms catalog body-level signals: sudden flinching indicates an acutely painful event, bucking or romping can reflect either sharp pain or frustration from chronic discomfort, and lip quivering or wincing suggests involuntary stress responses. A horse that becomes hyper-responsive or startle-prone may be showing a lowered tolerance for stimulation due to ongoing pain. Most of these tools were developed for horses at rest, though, and reliably reading pain signals in a horse galloping at 40 miles per hour during a race remains a challenge.
Are Conditions Improving?
By the numbers, yes. In 2024, racetracks operating under HISA’s safety program recorded a fatality rate of 0.90 per 1,000 starts. That’s a 35 percent decrease from the 1.39 rate reported in 2021, the last full year before HISA’s racetrack safety rules took effect, and a 55 percent decline from the 2.00 rate when the Equine Injury Database first started tracking fatalities in 2009. The gap between regulated and unregulated tracks is striking: U.S. racetracks not subject to HISA rules had a fatality rate of 1.76 per 1,000 starts in 2024, nearly double the rate at HISA-regulated tracks.
These improvements come from tighter whip rules, mandatory pre-race veterinary exams, better track surfaces, and limits on how horses are medicated before races. No single reform eliminates the risk. A jockey sitting at 12 percent of a horse’s body weight in a proper crouch, using a padded whip within strike limits, on a well-maintained track is a very different situation from a heavier rider with an unregulated whip on a poorly maintained surface. The harm a jockey causes is real but variable, shaped by the rules they follow, the equipment they use, and the systems designed to protect the horse underneath them.