# Thoroughbred Horse: Traits, Off-Track Care, and Health Problems The Thoroughbred is the world's premier racehorse breed, a tall, lean, deeply muscled athlete built for sustained speed over distance. Every registered Thoroughbred descends from one of three foundation sires imported to England in the late 17th and early 18th centuries, and the breed has been selected almost exclusively for racing performance ever since [1][2]. That history explains both the breed's greatest strengths and its most predictable problems. A Thoroughbred is fast, brave, intelligent, and highly reactive. The same traits that make a horse competitive on the track can make it challenging in a paddock or a dressage arena. Off the track Thoroughbreds, often called OTTBs, are widely available and can become outstanding sport and pleasure horses, but they need a structured letdown period, careful hoof and joint management, and realistic expectations about the health conditions that follow them out of racing. This guide covers breed traits, the major health problems documented in racing and off-track Thoroughbreds, and a practical plan for retraining a horse that has just left the track. This article is educational and is not a substitute for veterinary diagnosis or treatment. ## At a Glance | Trait | Detail | |--|--| | Origin | England, developed from three foundation sires in the late 1600s and early 1700s [1][2] | | Primary purpose | Flat racing, steeplechasing, and sport horse disciplines after retirement | | Height | Tall, athletic build typical of the breed (registry does not set a single height) | | Weight | Lean, muscular, often a hard keeper off the track | | Coat colors | Bay, chestnut, brown, black, gray, and other solid colors | | Lifespan | Long lived as a breed, with many horses working into their late teens and beyond | | Energy level | Very high, bred for speed and forward movement | | Grooming | Moderate, with close attention to feet and skin | | Trainability | Highly intelligent and willing, but reactive and sensitive | | Good with children | Generally not a beginner's horse, especially straight off the track | | Good with other pets | Variable, best assessed individually | ## History and Purpose of the Thoroughbred The Thoroughbred breed traces to three stallions brought to England from the Middle East and North Africa: the Byerley Turk, the Darley Arabian, and the Godolphin Arabian [1][2]. These three foundation sires were crossed with native English mares, and the resulting stock was selected generation after generation for speed and stamina over distance. The breed's stud book has been closed for centuries, meaning every registered Thoroughbred today descends from those three lines [1][2]. Racing shaped the breed's body and mind. Selection pressure favored horses that could run fast early, tolerate intense training, and recover quickly between efforts. That pressure produced a horse with a large heart, long legs, a deep chest, and a highly responsive nervous system. It also produced a horse with thin skin, fine bone in the lower leg, and a digestive tract poorly matched to the stabled, high-grain lifestyle of a racehorse. Those mismatches are the root of most Thoroughbred health problems. The breed spread worldwide, and today Thoroughbreds race in North America, Europe, Asia, Australia, and beyond. The Jockey Club in the United Kingdom and its counterparts elsewhere maintain the registry and the rules that define the breed [1][2]. Racing is the breed's economic engine, but the population of retired racehorses is large, and off-track Thoroughbreds now compete in eventing, show jumping, dressage, hunter paces, polo, and trail riding. ## Appearance and Build A Thoroughbred is built like a distance runner. The horse is tall and narrow, with a long neck, sloping shoulder, deep girth, and muscular hindquarters. The legs are long and relatively fine boned, with a short cannon bone and a well-defined fetlock. The skin is thin, the coat is fine, and the mane and tail are usually sparse. The breed standard favors an athletic, uphill build with a strong topline. Many Thoroughbreds are described as "blood" types, meaning lean and refined rather than heavily muscled. This build is efficient for running but leaves less margin for error in the feet and lower legs. Thin soles, shelly hoof wall, and a tendency toward foot soreness are common complaints in the breed, especially in horses that have spent years on hard racetrack surfaces. Coat colors are typically solid. Bay, chestnut, brown, and black are most common, with gray appearing in some lines. White markings on the face and legs are common and are recorded in the registry. ## Thoroughbred Temperament Thoroughbred temperament is the breed's defining feature and its biggest management challenge. These horses are intelligent, sensitive, and highly reactive. They notice everything, respond quickly to pressure, and can escalate from calm to explosive in a fraction of a second. That reactivity is a performance asset on the track, where a horse must respond instantly to a jockey's cues and to the movement of competitors. Off the track, the same temperament can look like anxiety. A retired racehorse may spook at novel objects, struggle to stand still, or become agitated in a busy barn. Many Thoroughbreds are described as "hot" or "sharp," meaning they carry tension and need a confident, quiet handler. Others are remarkably calm and settle quickly into a second career. The breed is also notably willing. Thoroughbreds tend to try hard, learn fast, and bond strongly with consistent handlers. A horse that was difficult under race training often becomes cooperative once its routine changes and its stress load drops. This combination of sensitivity and willingness is why the breed excels in eventing and other disciplines that reward bravery and athleticism. Prospective owners should understand that Thoroughbred temperament varies widely between individuals. A horse's behavior on the track is a poor predictor of its behavior six months after letdown. The best approach is to evaluate the individual horse in a low-stress environment and to plan for a gradual transition. ## Exercise and Training Needs Thoroughbreds need daily movement and structured work. A horse that has been in race training is fit and muscular, and its body expects a high level of activity. Sudden removal of that activity is a welfare problem. The letdown process, described in detail below, is designed to reduce fitness gradually rather than abruptly. For a Thoroughbred in a second career, the ideal program combines turnout, hacking, and progressive schooling. Turnout is essential. Young Thoroughbreds on stud farms that were turned out 24 hours a day had lower rates of musculoskeletal disease and injury than horses turned out for shorter periods, and each additional acre of turnout area during the fourth month of life was associated with reduced injury risk [3]. That finding comes from foals, but the principle of generous, consistent turnout applies across the breed's life. Training should build fitness gradually. In racehorses, both too little and too much high-speed exercise increase musculoskeletal injury risk [4]. Trainers who used shorter, more frequent rest periods and who avoided long stretches of fast work before a horse was race fit had lower injury rates in two-year-olds [4]. For a sport horse, the practical translation is to avoid sudden increases in speed or duration, to schedule regular easy weeks, and to monitor the horse for subtle changes in stride and attitude. ## Grooming and Hoof Care Grooming a Thoroughbred is straightforward, but the feet deserve special attention. The breed is known for thin soles and variable hoof quality, and many off-track horses arrive with hoof walls that have been stressed by years of racing plates and hard surfaces. Daily hoof picking, regular farrier visits, and a hoof care plan developed with a veterinarian and farrier are standard. Skin care matters as well. Thoroughbreds have fine coats and thin skin, and they can be sensitive to insects and to harsh grooming tools. A soft brush, a clean stable, and routine fly control keep most horses comfortable. Because the breed is often a hard keeper, grooming sessions are also a useful time to assess body condition. Ribs that are too visible, a dull coat, or a loss of topline can signal that the horse needs a feeding or veterinary review. ## Feeding a Thoroughbred, Including the Hard Keeper Nutrition is where many off-track Thoroughbreds struggle. Racehorses are typically fed large amounts of grain to fuel intense exercise, and their digestive tracts adapt to that routine. When training stops, the grain ration must be reduced, but the horse's appetite and metabolism may not adjust quickly. The result is a horse that looks thin, anxious, and difficult to keep weight on, a classic hard keeper. A hard keeper needs a ration built around high-quality forage, with concentrated energy sources used strategically. The horse's teeth should be checked, because dental pain is a common and easily missed cause of weight loss. A veterinarian can help rule out gastric ulcers, which are extremely common in racehorses and can suppress appetite and condition [5][6]. Parasite control, a warm blanket in cold weather, and a calm environment all support weight gain. Feeding frequency matters. Horses are designed to eat small meals throughout the day, and multiple small feedings are gentler on the stomach than one or two large ones. Free-choice or near free-choice hay, along with a balanced vitamin and mineral supplement, forms the foundation of most off-track diets. Any change in feed should be made gradually over one to two weeks. Owners should discuss the specific ration with a veterinarian or an equine nutritionist. ## Health Problems in Thoroughbreds Thoroughbreds carry a well-documented set of health risks that follow from their breeding and their racing careers. The most important are gastric ulcers, exercise-induced pulmonary hemorrhage, hoof problems, and musculoskeletal injury. ### Gastric Ulcers Equine gastric ulcer syndrome is one of the most common diseases in racing Thoroughbreds. In a study of 202 Thoroughbreds in active race training, gastric ulceration of the squamous mucosa was identified in 82 percent of horses [6]. A separate study of Korean Thoroughbred racehorses found a prevalence of 100 percent after racing [5]. A study of horses used for historical races in Italy found squamous gastric disease of at least grade 2 in 88 percent of horses and glandular disease in 45 percent [7]. These figures show how routine this condition is in the breed. Ulcers cause subtle signs more often than dramatic ones. Poor coat, colic, and changes in serum creatinine have been associated with higher ulcer scores [6]. Many horses show reduced appetite, girthiness, poor performance, or behavioral changes. Diagnosis is made by gastroscopy, and endoscopic examination is the standard method for confirming the disease [6]. Treatment is well established. Omeprazole, an acid pump inhibitor, heals squamous ulcers faster than vehicle treatment, with complete healing of the entire stomach in 10 to 21 days in treated horses compared with 14 to 28 days in only some untreated horses [8]. In a large multicenter trial, gastric ulcers were completely healed in 77 percent of omeprazole-treated horses by day 28, and 92 percent were significantly improved, while 96 percent of sham-dosed horses still had ulcers [9]. Omeprazole paste at 4 mg/kg once daily is the standard regimen used in these studies [10][9]. A compounded suspension was less effective than the paste formulation in one trial, with higher serum concentrations and better healing after paste administration [10]. Prevention matters because recurrence is common. Horses removed from omeprazole treatment at day 28 had ulcer incidence and severity similar to untreated horses by the end of the study [9]. A half dose maintained improvement in horses that continued treatment [9]. Ranitidine has also been used, but omeprazole had a greater therapeutic effect in a direct comparison [5]. A 2026 study raised a new consideration. Cumulative omeprazole administration during the preceding 30 days was associated with an increased hazard of exercise-induced pulmonary hemorrhage detection in Thoroughbred racehorses, with a hazard ratio of 1.08 for each 10-gram increase [11]. The same study found no association between omeprazole and fracture or atrial fibrillation [11]. This finding does not change the role of omeprazole in treating ulcers, but it is a reason for veterinarians to use the drug strategically rather than continuously in horses in race training. Owners of off-track Thoroughbreds should ask whether the horse has a history of ulcers and should have a veterinarian evaluate any horse with poor appetite, poor condition, or behavioral changes. Gastric ulcers are a leading cause of poor performance in racehorses, and treatment should be guided by endoscopic diagnosis. ### Exercise-Induced Pulmonary Hemorrhage Exercise-induced pulmonary hemorrhage, or EIPH, is bleeding into the lungs during intense exercise. It is caused by stress failure of the pulmonary capillaries when pressures inside the vessels exceed the strength of the capillary wall [12]. EIPH is extremely common in racing Thoroughbreds and is graded by endoscopy after exercise. Furosemide, a diuretic, reduces the severity of EIPH and lowers pulmonary arterial and pulmonary wedge pressures during supramaximal exercise [12]. In a controlled study of fit retired Thoroughbreds with consistent EIPH grade 2 or higher, furosemide decreased mean pulmonary arterial pressure and pulmonary wedge pressure during high-intensity treadmill exercise [12]. This is the pharmacological basis for the widespread use of furosemide on race day in North America. Environmental factors influence EIPH as well. In a prospective study of 815 two-year-old and 122 older Thoroughbred racehorses across 12 US racetracks, higher ambient temperature was associated with lower EIPH prevalence and severity, furosemide administration was associated with lower prevalence, and racing on turf was associated with lower prevalence compared with other surfaces [13]. These findings show that EIPH risk is not fixed. It varies with weather, surface, medication, and the individual horse. For off-track horses, EIPH is usually a historical concern rather than an active problem. Horses that bled during racing may have residual lung changes, and any horse with a history of EIPH should be evaluated by a veterinarian before returning to high-intensity work. A cough, poor recovery, or nosebleed after exercise warrants examination. EIPH is best managed by reducing the intensity and frequency of high-speed work and by addressing underlying airway disease. ### Thin Soles and Hoof Quality Thin soles and poor hoof quality are recurring problems in Thoroughbreds. Years of racing on hard tracks, repeated shoeing cycles, and a fine-boned lower leg all contribute. A horse with thin soles may be foot sore on hard ground, sensitive to shoeing, or prone to abscesses. Management centers on good farriery, appropriate shoeing or barefoot transition, and surface selection. A veterinarian and farrier should work together to assess sole depth, hoof wall quality, and the horse's movement. Radiographs can help evaluate sole thickness and the position of the coffin bone. Owners should avoid forcing a thin-soled horse onto abrasive or rocky ground and should plan a gradual transition if the goal is to remove shoes. Hoof supplements and topical treatments are widely marketed, but the foundation of hoof health is nutrition, circulation from movement, and correct trimming. A balanced diet with adequate zinc, copper, and biotin supports hoof growth, and turnout on varied terrain stimulates the hoof. Any horse with chronic foot pain should be evaluated for laminitis, navicular syndrome, and other causes rather than assumed to have thin soles alone. ### Musculoskeletal Injury Musculoskeletal injury is the most serious health risk in the breed. In North American racing, the incidence of fatal musculoskeletal injury was 1.49 per 1,000 starts across 3,851,659 race starts between 2009 and 2023 [14]. That figure comes from the Equine Injury Database, a census-level record covering most US and Canadian race starts [14]. Risk factors are well studied. Claiming race variables and void claim rules were associated with fatal musculoskeletal injury, with horses racing as claimers at increased odds compared with non-claimers [14]. Turf track condition interacts with speed and injury risk, and track surface measurements vary with season and weather [15]. A machine learning analysis of stride characteristics found that musculoskeletal injury was predicted by an increased number of starters, greater variation in speed, and a lower percentage of career time at rest [16]. Decreasing speed and stride length over successive races have also been associated with injury, which supports longitudinal monitoring of stride as an early warning tool [16]. Training practices matter. In a survey of 66 Australian Thoroughbred trainers, the incidence of race day musculoskeletal injury in two-year-olds was lower for trainers who used shorter times to trial, less fast work before trialing, shorter and more frequent rest periods, and higher amounts of fast work once race fit [4]. For mature horses, longer rest periods were associated with lower injury incidence [4]. These findings point to the value of planned rest and gradual fitness building. The COVID-19 pandemic provided an unintended natural experiment. When training and racing schedules were interrupted in early 2020, the incidence of fatal musculoskeletal injury among two-year-old Thoroughbreds in North America increased significantly compared with 2009 to 2019 [17]. When schedules returned to normal in 2021 and 2022, the incidence returned to baseline [17]. The increased risk was limited to horses that were two years old in 2020, and horses aged three or older in 2020 were not at increased risk [17]. The lesson is that a delayed or disrupted start to training can raise injury risk in young horses, likely because fitness and bone adaptation depend on a consistent loading schedule. Early detection is improving. Accelerometer-based sensors worn during racing and breezing have identified horses at very high risk of catastrophic musculoskeletal injury, and follow-up imaging with 18F-sodium fluoride positron emission tomography has located impending condylar fractures and slab fractures before they became catastrophic [18]. Serum phosphorylated neurofilament heavy subunit has also been studied as a marker, with higher concentrations in horses that suffered catastrophic injury during training compared with racing, and a correlation with lifetime starts [19]. These tools are not yet routine in private practice, but they show the direction of equine sports medicine. For off-track Thoroughbreds, the practical message is that the breed's musculoskeletal system is finely tuned and easily overloaded. A horse coming off the track should have a full lameness examination, including flexion tests and imaging as indicated, before starting a new career. Any heat, swelling, or change in gait should be investigated promptly. ### Other Health Considerations Thoroughbreds are also subject to the general health problems of horses, including colic, respiratory disease, and dental disease. Young Thoroughbreds on stud farms have high rates of developmental orthopedic disease, with almost half of a UK and Ireland birth cohort requiring veterinary intervention for musculoskeletal disease or injury, predominantly developmental orthopedic disease [20]. Broodmares also have a notable rate of musculoskeletal and other conditions during gestation [21]. These findings describe the breed's early-life and reproductive health, and they are relevant to anyone considering breeding or buying a young Thoroughbred. ## Thoroughbred Lifespan The Thoroughbred is a long-lived breed. Many horses remain sound and useful into their late teens and early twenties, and some continue in light work beyond that. Lifespan depends heavily on career management, hoof and joint health, and the quality of care after racing. A horse that raced extensively and accumulated joint damage may have a shorter working life than a horse that raced lightly or not at all. Regular veterinary care, appropriate nutrition, and controlled exercise support longevity. ## Letting Down and Retraining an Off-Track Thoroughbred An off the track Thoroughbred, or OTTB, is a horse that has finished its racing career and is transitioning to a new life. This transition is the single most important period in the horse's post-racing life. Done well, it produces a sound, willing partner. Done poorly, it produces a thin, anxious horse with ulcers, hoof pain, and behavioral problems. ### Step 1: Veterinary Evaluation The first step is a thorough veterinary examination. The horse should be evaluated for lameness, hoof condition, body condition, and signs of gastric ulcers. A history of EIPH, joint injections, or prior injuries should be obtained from the trainer or aftercare organization. Baseline radiographs of the feet and joints may be useful. Vaccination and deworming status should be updated, and dental care should be scheduled. ### Step 2: Letdown Letdown is the process of reducing a horse's fitness and stress load gradually. A racehorse is fit, fed a high-energy diet, and accustomed to a rigid daily routine. Removing all of that at once causes physical and behavioral problems. A typical letdown gives the horse turnout, reduces grain, and replaces intense work with light hacking or walking under saddle. The goal is to let the horse relax without losing all fitness or developing stable vices from boredom. During letdown, monitor body condition, appetite, and behavior. A horse that loses weight, develops diarrhea, or becomes agitated may have ulcers or another medical problem and should be examined. The transition from race feed to a forage-based diet should be gradual, over one to two weeks. ### Step 3: Retraining Retraining begins once the horse is settled and healthy. The pace should be slow. A racehorse has been trained to run forward under a rider, often in company, and it may not know how to walk calmly, stand still, or accept a contact. Basic flatwork, ground manners, and hacking build the foundation for any discipline. Consistency and patience matter more than intensity. Short, frequent sessions are better than long, demanding ones. The horse should be rewarded for relaxation and calmness. A trainer experienced with off-track Thoroughbreds can help, and many aftercare organizations provide guidance and placement support. ### Step 4: Managing the Hard Keeper Many OTTBs are hard keepers during and after letdown. The feeding plan should be reviewed with a veterinarian or nutritionist. Forage quality, feeding frequency, dental health, and ulcer status all affect weight. A horse that does not gain weight despite adequate feed should be evaluated for ulcers, dental disease, and internal parasites. ### Step 5: Long-Term Soundness Long-term soundness depends on turnout, gradual fitness, and prompt attention to lameness. The breed's thin soles and fine bone mean that hoof care and surface management are ongoing priorities. Regular farrier visits, appropriate shoeing, and a training surface that suits the horse all reduce injury risk. Owners should keep records of the horse's work and watch for changes in stride, attitude, or performance, because these can be early signs of musculoskeletal injury [16]. ## Finding a Responsible Breeder or Rescue Thoroughbreds are rarely bred as pets. Most are bred for racing, and most off-track horses come through aftercare organizations, trainers, or adoption programs. A responsible source will provide veterinary records, a racing history, and honest information about the horse's soundness and temperament. Prospective buyers should ask about prior injuries, joint injections, ulcer history, and hoof problems. A prepurchase examination by an independent veterinarian is essential. The exam should include a lameness evaluation, hoof assessment, and, when indicated, imaging. Buyers should be wary of any seller who discourages a prepurchase exam or who cannot provide basic health records. Rescue and aftercare organizations are a common route to OTTB ownership. These groups typically foster horses, assess their temperaments, and provide adoption support. ## Who Should Not Get a Thoroughbred A Thoroughbred is not the right horse for every owner. The breed is best suited to riders with experience, confidence, and a willingness to invest in structured training and veterinary care. A first-time horse owner, a rider who wants a push-button trail horse, or a household without the time and facilities for daily turnout should consider a different breed or a well-trained older horse. Thoroughbreds can be wonderful family horses once they are settled, but a horse straight off the track is not a beginner's mount. The breed's reactivity, fitness, and medical history all require knowledgeable management. A prospective owner should be honest about their experience, their facilities, and their budget before taking on an OTTB. ## Limitations and When to Contact a Veterinarian This article is educational and is not a substitute for veterinary diagnosis or treatment. Individual horses vary, and every health or behavior concern should be evaluated by a veterinarian who can examine the horse in person. Contact a veterinarian promptly if a Thoroughbred shows any of the following: - Lameness, heat, swelling, or a change in gait that persists beyond a day - A nosebleed after exercise, a cough, or poor recovery after work - Loss of appetite, weight loss, diarrhea, or colic signs - Behavioral changes such as new aggression, anxiety, or resistance under saddle - Foot soreness, abscesses, or reluctance to walk on hard ground - Any wound, swelling, or injury that does not improve within 24 to 48 hours A veterinarian should also be involved in any decision to start, stop, or change medication, including omeprazole, and in the design of a letdown and retraining plan for a horse coming off the track. ## Frequently Asked Questions ### What is a Thoroughbred horse? A Thoroughbred is a horse breed developed in England for racing, descended from three foundation sires: the Byerley Turk, the Darley Arabian, and the Godolphin Arabian [1][2]. The breed is known for speed, athleticism, and a sensitive, willing temperament. ### What is an off the track Thoroughbred? An off the track Thoroughbred, or OTTB, is a Thoroughbred that has finished racing and is being retrained for a second career. OTTBs are common in eventing, show jumping, dressage, and pleasure riding. ### What is a Thoroughbred's temperament like? Thoroughbreds are intelligent, sensitive, and reactive. They learn quickly and try hard, but they can be anxious or explosive under stress. Temperament varies widely between individuals, and a horse's behavior often improves after a structured letdown period. ### How long do Thoroughbreds live? Thoroughbreds are a long-lived breed, with many horses working into their late teens and beyond. Lifespan depends on career management, soundness, and the quality of care after racing. ### Do all Thoroughbreds get gastric ulcers? Gastric ulcers are extremely common in racing Thoroughbreds. Studies have found squamous ulceration in 82 percent of horses in active race training and in nearly all horses examined after racing [5][6]. Off-track horses can also have ulcers, especially during the stress of letdown and retraining. ### What is EIPH in Thoroughbreds? EIPH stands for exercise-induced pulmonary hemorrhage, which is bleeding into the lungs during intense exercise. It is caused by stress failure of the pulmonary capillaries and is common in racing Thoroughbreds [12]. Furosemide reduces its severity, and environmental factors such as temperature and surface influence its occurrence [13][12]. ### Can an off the track Thoroughbred become a pleasure horse? Yes. With a proper letdown, veterinary care, and patient retraining, many OTTBs become sound and willing pleasure horses. The transition takes time, and the horse's feed, turnout, and workload must be managed carefully. ### What health problems are common in Thoroughbreds? The most common health problems are gastric ulcers, exercise-induced pulmonary hemorrhage, thin soles and poor hoof quality, and musculoskeletal injury [11][12][5][6][15][14]. Young Thoroughbreds also have high rates of developmental orthopedic disease [20]. ## Related Articles - [How Long Do Horses Live? Lifespan and Senior Care](/knowledge/veterinary-medicine/equine-care/horse-lifespan) - [Equine Lifespan: Factors Influencing Longevity in Horses](/knowledge/veterinary-medicine/equine-care/equine-lifespan-factors-influencing-longevity-in-horses) - [Horse Hoof Care: Anatomy, Trimming, and Common Problems](/knowledge/veterinary-medicine/equine-care/horse-hoof-care-anatomy-trimming-and-common-problems) - [Common Horse Health Problems Every Owner Should Know](/knowledge/veterinary-medicine/equine-care/horse-health-problems) - [Miniature Horse Care Guide](/knowledge/veterinary-medicine/equine-care/miniature-horse-care) - [Horse Blanketing: When and How](/knowledge/veterinary-medicine/equine-care/horse-blanketing-guide) - [Friesian Horse: Temperament, Care, and Genetic Health Problems](/knowledge/veterinary-medicine/equine-care/friesian-horse-breed-guide) - [Norwegian Fjord Horse: Size, Temperament, Color, and Care](/knowledge/veterinary-medicine/equine-care/norwegian-fjord-horse-breed-guide) - [Morgan Horse: History, Temperament, Uses, and Health](/knowledge/veterinary-medicine/equine-care/morgan-horse-breed-guide) ## Sources 1. 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