Why Do Racehorses Get Put Down? What Owners Need to Know About On-Track Injuries and Euthanasia

Racehorses get put down for one dominant reason: a catastrophic limb injury that cannot be repaired and cannot be survived humanely. In 2025, that happened at a rate of 1.07 per 1,000 starts in North American Thoroughbred racing — about one fatality in every 935 starts, the lowest rate since national record-keeping began in 2009. The number is small per race and real per career, and if you own or are about to own a piece of a racehorse, the process behind it — who decides, what the vet can do without you, what your insurance requires within hours — is something to understand before the phone rings, not after. I would rather you read this piece and never need it.

Why racehorses get put down: the honest answer

Racehorses get put down because equine anatomy turns certain leg injuries into fatal ones: a 1,100-pound animal on four slender limbs cannot survive months of immobilized healing the way a human with a broken leg can. A horse must bear weight on all four legs almost continuously. When a shattered fetlock or sesamoid fracture makes that impossible, the load shifts to the opposite limb, which frequently develops laminitis — an excruciating, incurable failure of the hoof’s internal structures. Blood supply in the lower limb is poor, many fractures cannot be stabilized against a horse’s instinct to stand and move, and infection risk in surgical repair is high. The American Association of Equine Practitioners’ euthanasia guidelines frame the decision around exactly this: chronic unmanageable pain, a hopeless prognosis for a good quality of life, or a future of permanent confinement and continuous medication. Euthanasia in those cases is not a cost decision. It is the humane exit from a condition medicine cannot fix.

That is the answer for the catastrophic cases, which drive the racing statistics. Away from the track, older or retired Thoroughbreds are euthanized for the same reasons any horse eventually is — severe colic, untreatable laminitis, the infirmities of age. Those endings belong to the broader aftercare story, which we cover in our owner’s guide to OTTBs and the aftercare system. This piece stays on the racing side: the breakdown, the decision, and the owner’s position in it.

How often racehorses die racing: the 2025 numbers

Racing fatalities in 2025 occurred at a rate of 1.07 per 1,000 Thoroughbred starts in North America, the lowest figure in the Equine Injury Database’s seventeen years. That number comes from The Jockey Club’s Equine Injury Database release for 2025, and it is the industry-consensus figure — a 3.6% improvement on 2024 and a 47% decline from 2009, the sixth consecutive year below 1.5. HISA’s 2025 annual metrics report corroborates it from the regulatory side: tracks racing under HISA rules recorded 1.04 racing-related fatalities per 1,000 starts, against 1.21 at U.S. tracks outside HISA’s jurisdiction, with roughly 99.9% of starts completed without a fatality. Training is its own exposure: HISA-regulated tracks reported 0.55 training-related deaths per 1,000 timed workouts.

Racing fatality rates in 2025, by measure

Measure	2025 rate	Source
All North American Thoroughbred starts	1.07 per 1,000 starts	Jockey Club Equine Injury Database
Tracks under HISA rules	1.04 per 1,000 starts	HISA 2025 Annual Metrics Report
U.S. tracks outside HISA rules	1.21 per 1,000 starts	HISA 2025 Annual Metrics Report
Training fatalities (HISA tracks)	0.55 per 1,000 workouts	HISA 2025 Annual Metrics Report
Change since 2009	Down 47%	Jockey Club Equine Injury Database

Here is our read of those numbers, because the consensus figure and the owner’s figure are not the same thing. A 0.107% chance per start sounds negligible. But compound that same 1.07-per-1,000 rate across a 25-start career and the cumulative exposure works out to about 2.6% — roughly one horse in forty — before you count training miles. The industry is right that safety has genuinely improved; the reform record since 2009 is real. What the improving averages cannot do is tell you whether your horse is the exception. Ownership means holding both facts at once: the risk per start is small, and the risk per career is large enough that every sound owner should have a plan for the worst morning.

Why a broken leg so often ends a horse’s life

A broken leg is so often fatal for a racehorse because the injuries concentrate at the fetlock — the ankle-like joint that absorbs enormous load at speed — and researchers at the UC Davis Veterinary Orthopedic Research Laboratory identify fetlock failures, particularly proximal sesamoid bone fractures, as the most common cause of death in Thoroughbred racehorses. Most racing fatalities are musculoskeletal. The mechanics are unforgiving: at forty miles per hour, a misstep loads a joint already operating near its structural limit.

Surgical repair exists, and for some fractures it works — screws, plates, arthrodesis. The obstacles are what come after. A horse cannot be told to stay off the leg. Recovery from anesthesia is itself dangerous; a disoriented horse standing up on a repaired limb can undo the surgery in seconds. And the opposite leg, carrying doubled weight for weeks, is a laminitis candidate the whole time. Veterinarians take repair seriously when the injury allows it — the sport has poured real money into surgical advances and injury prevention research. But when the fracture is open, comminuted, or has severed blood supply, the honest surgical prognosis is suffering with no endpoint. That is the line the AAEP criteria draw, and it is the right line.

Euthanasia after a catastrophic breakdown is not a failure of will or budget. It is what responsible stewardship looks like when medicine runs out of road.

What happens on the track after a breakdown

When a horse breaks down in a race, a practiced protocol starts within seconds: the jockey pulls up, outriders reach the horse, and the track’s attending veterinarian is at its side, usually inside a minute or two. The screens you sometimes see go up serve two purposes — they calm the injured horse, and they give the veterinary team room to make a clinical assessment without a grandstand watching over their shoulders. The horse is sedated for pain. The equine ambulance positions to transport if transport is viable.

The assessment itself is fast because the relevant facts are usually visible: which structures failed, whether the limb can bear any weight, whether the horse can be stabilized enough to reach a surgical hospital. Some horses vanned off the track go on to full surgical repair and recovery — we walk through that pathway in what happens when a racehorse gets injured. For the injuries that cannot be repaired, euthanasia is typically performed on the track or in the receiving barn: heavy sedation first, then an overdose of anesthetic. It is quick, and it is administered by a veterinarian whose entire professional obligation in that moment is the horse.

Owners are rarely part of that sequence in real time. If you are in the grandstand, you may learn the outcome from your trainer before the next race goes off. If you are at home, you get a phone call. The speed can feel brutal from the outside. Weigh the alternative — a badly injured horse held in pain while adults reach a consensus by phone — and the speed is the mercy.

Who decides to euthanize a racehorse

Decision authority over euthanasia depends on the scenario: in a catastrophic on-track emergency the attending and regulatory veterinarians effectively decide on humane grounds, while in non-emergency cases the owner decides with veterinary guidance — and in a syndicate, the agreement you signed decides who counts as “the owner.” That last clause is the one prospective owners consistently miss. Consider a first-time partner holding 5% of a horse through a managing operator. The partnership agreement typically delegates emergency veterinary decisions, including humane destruction, to the operator or trainer. That delegation is reasonable — someone reachable must hold the authority — but you should know it exists before you sign, not discover it in a phone call.

Euthanasia decision authority, by scenario

Scenario	Who effectively decides	The owner’s real role
Catastrophic on-track injury	Attending / regulatory veterinarians	Notified, usually after the fact
Severe injury, surgery possible	Owner (or authorized operator) with surgeons	Chooses between repair attempt and euthanasia, on clinical advice
Chronic condition (laminitis, colic complications)	Owner with regular veterinarian	Full decision-maker, guided by AAEP criteria
Syndicate or partnership horse	Whoever the agreement designates	Whatever the agreement says — read it before signing
Insured horse, non-emergency	Owner, with insurer notification	Must notify insurer promptly; policy may require consultation

We hold a firm position here: an operator who cannot show you, in writing, who holds euthanasia and major-veterinary authority for your horse has not earned your signature. This is standard buyer due diligence, the same discipline we apply in our buyer’s guide to purchasing a racehorse — and it costs nothing to check.

Mortality insurance and the financial aftermath

Equine mortality insurance pays the horse’s insured value if it dies or must be humanely destroyed, and annual premiums generally run in the range of 4.85% to 6.25% of insured value, sliding lower as the value rises. We break down the policy mechanics — what mortality coverage includes, what it excludes, and the claiming-race clause that quietly reduces your insured value — in our guide to racehorse mortality insurance. Two features matter most on the worst day. First, humane destruction on veterinary advice is a covered cause of death under standard policies, so a track-side euthanasia does not forfeit the claim. Second, insurers require prompt notice of any serious injury or illness — miss the notification window and a later claim can be denied. In a syndicate, confirm who carries the policy, who pays the premium, and who is responsible for that notification. If the answer is nobody, you have found a gap worth raising before it costs you.

Insurance is also where sentiment and accounting collide, and it deserves saying plainly: a mortality payout replaces capital, not the horse. Owners who have been through a breakdown rarely describe the check as the hard part. What insurance actually buys is the freedom to make the humane decision without a financial argument in the room — which is reason enough, in our view, to carry it on any horse whose loss you could not absorb. Where the horse survives but cannot race again, you are in different territory — retirement, rehoming, second careers — with its own costs, covered in what a racehorse actually costs to own.

What to check before you buy in

The time to deal with euthanasia risk is during due diligence, when it is a paperwork question rather than an emergency. Four checks cover most of the ground:

1. Read the veterinary-authority clause. Know who can authorize euthanasia and major procedures for your horse, and under what conditions you are consulted.
2. Confirm the insurance position. Is the horse insured, for how much, who pays the premium, and who owes the insurer prompt notice after an injury?
3. Ask about the aftercare pathway. A credible operator can tell you, specifically, what happens to horses that survive a career-ending injury — and organizations accredited by the Thoroughbred Aftercare Alliance are the standard to look for.
4. Ask how owners are notified. The operators worth your money have a practiced answer, because they have made these calls before.

None of this makes the worst morning painless. It makes it survivable, and it keeps the decisions where they belong — made in advance, on your terms, with the horse’s welfare fixed at the center. The far more common ending, for the record, is a live one: most racehorses leave the track walking, and what happens next is the subject of our aftercare guide.

— Race Horse Ownership 101