10 Horse PPE Red Flags That Should Make You Walk Away

Last updated: January 2, 2026

By: Miles HenryFact Checked

I’ll never forget the day I thought I’d found a steal—a $4,000 claimer that looked sound and moved like a champ in the paddock. I talked myself out of a full PPE (truth is, most trainers won’t let you do one on a horse still racing anyway). That shortcut cost me over $8,000 in knee chips, corrective shoeing, and vet bills over the next eighteen months.

It also taught me a lesson that’s saved me tens of thousands since: not every PPE finding is a dealbreaker — but some absolutely are. After thirty years around barns, tracks, and sale barns, I’ve learned the most expensive horse you’ll ever own is the one you buy without knowing which red flags to run from.

Why Severity Matters More Than Existence

Here’s something that surprises most first-time buyers: a recent study published in the Equine Veterinary Journal found that 57.1% of 847 horses examined had findings that could prevent you from using the horse for what you need it for. That’s right—more than half of all horses fail a “perfect” PPE if you’re looking for zero abnormalities.

Around our barn, we say half the horses got somethin’—it’s pickin’ the right “somethin'” that counts.

But here’s the thing—having a finding doesn’t automatically mean you should walk away. I’ve bought horses with minor issues that became family treasures, and I’ve walked away from horses that looked perfect on paper but had one critical red flag. The difference comes down to understanding three things: what the finding actually means, how it affects your intended use, and whether it’s progressive or manageable.

Context is everything. A mild navicular change in a 16-year-old pleasure horse heading for light trail riding? That might be perfectly manageable with proper shoeing. The same finding in a 7-year-old hunter prospect? That’s a ticking time bomb that’ll cost you thousands in maintenance and probably end their jumping career within a few years.

I remember looking at a gorgeous mare priced at $15,000; it seemed like a steal for her movement and training. The PPE came back with ultrasound findings showing hindlimb proximal suspensory damage. The seller tried to downplay it, saying she’d been going fine for months. I walked away. That mare changed hands three times in two years and never competed again. Sometimes the best purchase is the one you don’t make.

Your budget matters too. If you’re spending $5,000 on a backyard horse, your tolerance for manageable issues should be higher than if you’re dropping $50,000 on a competition prospect. But regardless of price point, there are certain findings that should make you walk away every single time.

The Three-Category Framework

In my three decades of buying, selling, and training horses, I’ve developed a simple system for evaluating PPE findings. It’s not perfect—every horse and situation is unique—but it’s saved me from costly mistakes more times than I can count.

Category 1: Dealbreakers (Walk Away Immediately)

These are findings with poor to guarded prognosis, high ongoing management costs, and progressive deterioration. They’re typically career-limiting or career-ending for athletic horses, and they’ll cost you far more in the long run than walking away will cost you today. Category 1 findings include severe navicular disease in young horses, major suspensory ligament damage (especially hindlimb proximal), positive drug screens without disclosure, and severe multi-limb flexion responses indicating systemic issues.

With Category 1 findings, the math is simple: even if the seller drops the price by half, you’re still buying someone else’s problem. These conditions typically require aggressive treatment that may or may not work, ongoing management that adds up quickly, and they carry a high risk of complete breakdown.

Category 2: Negotiation Points (Significant Price Reduction)

Category 2 findings are manageable with proper care and known ongoing costs. They may limit certain activities but not all use, and they’re stable rather than rapidly progressive. Examples include moderate navicular changes in older horses intended for light work, upper airway issues like laryngeal hemiplegia in lower-level horses, suspensory branch lesions that have a fair prognosis with proper rehabilitation, and back or sacroiliac pain that responds to treatment.

For Category 2 findings, I typically negotiate a price reduction of 25-50% depending on severity and the projected cost of management. If a horse is listed at $10,000 and has findings that’ll cost $3,000-5,000 annually to manage, that horse should be priced at $5,000-7,000 maximum. Don’t let emotion or sales pressure convince you otherwise.

Category 3: Monitoring Issues (Buy With Eyes Open)

These are common findings that don’t significantly affect the horse’s ability to do the job you’re buying them for. They’re often age-appropriate changes, cosmetic issues, or minor abnormalities that require monitoring but not aggressive treatment. Examples include small windpuffs or old injuries with complete healing in older horses, minor arthritis appropriate for the horse’s age and work history, and small radiographic changes that the veterinarian considers clinically insignificant for your intended use.

Category 3 findings shouldn’t necessarily result in a price reduction, but they should be thoroughly documented in the PPE report. Make sure your veterinarian gives you a clear prognosis and explains what to watch for going forward. These are “buy with eyes open” situations—you’re accepting the horse knowing these issues exist, so you can’t come back later claiming you didn’t know.

The Discipline Factor

One of the biggest mistakes I see buyers make is applying the wrong standards for their intended use. What fails for racing may work perfectly fine for trails. A respiratory issue that would end a racehorse’s career might not affect a dressage horse at all. A hock that can’t handle the torque of barrel racing might be perfectly fine for lower-level dressage.

Always evaluate PPE findings through the lens of what you actually plan to do with the horse. Be honest with yourself about your ambitions, too. If you’re telling yourself you just want a trail horse but secretly dream of competing, use the competition standard when evaluating findings.

Interactive PPE Red Flags Severity Matrix

Red Flag #1: Severe Navicular Changes in Young Horses

What it is
Navicular syndrome involves degenerative changes to the navicular bone, bursa, and deep digital flexor tendon inside the hoof. In a younger horse—especially under about 10—radiographs showing significant remodeling, cyst‑like lesions, or a badly broken‑back hoof‑pastern axis are early warning signs that those feet will only get worse with work. If you want a deeper dive on this issue, read my full guide on navicular syndrome in horses.

Why it matters
Recent veterinary references describe navicular as a progressive, degenerative condition with a guarded prognosis, even with aggressive treatment. When you combine that with data showing limb and lameness issues are the most common “prejudicial findings” on pre‑purchase exams, bad navicular films in a young horse are about as close to a guaranteed money pit as you’ll find.​

My barn‑reality story
I vetted a stunning 7‑year‑old that moved like a $50,000 horse but was priced around $18,000. On the outside he was perfect; on the radiographs, my vet flinched—moderate‑to‑severe navicular changes in a horse that young told us everything we needed to know. The seller tried to spin it as “normal for his age,” but I walked away. A couple of years later, I heard his new owner had burned through five‑figure vet bills trying to keep him going and he was retired to pasture before he ever had the career he was sold for.

Cost implications

• Upfront diagnostics and treatments (nerve blocks, advanced imaging, initial therapies) often run into the low four‑figure range.
• Ongoing maintenance—Specialized navicular shoes run $150-300 every 5-6 weeks instead of standard $80-120 shoes. Joint injections every 6-12 months add $800-1,200 per joint. Over a 5-year period, you’re looking at $8,000-15,000 in additional costs.
• Hidden costs include a shortened competitive career, reduced resale or no resale at all, and plenty of lost training time when the horse goes off.

When it’s acceptable vs. not

• Acceptable: An older horse for light trail or truly low‑level use, at a fair price that already assumes a shorter soundness window, and only if your vet and farrier both believe it’s manageable.
• Not acceptable: Any racing, jumping, barrel, or serious performance prospect under about 10 with significant navicular changes; for most buyers, that’s a hard no.

Clear action step

If your vet says the words ‘significant navicular changes’ on any horse under 10 that you want to jump, run barrels, event, or show seriously — walk away. Doesn’t matter how pretty the trot is. Full stop.

Red Flag #2: Hindlimb Proximal Suspensory Desmitis

What it is
Hindlimb proximal suspensory desmitis (PSD) is damage or inflammation at the top of the suspensory ligament in the hind leg. On ultrasound, you’ll see fiber disruption, enlargement, or a fuzzy, poorly defined ligament; under saddle, it often shows up as a nagging, hard‑to‑pin‑down hind‑end lameness that gets worse with work.

Why it matters
Hind PSD has one of the lowest, most frustrating return‑to‑full‑work rates of the soft‑tissue injuries, especially in sport and racehorses. It tends to be chronic, expensive to manage, and a frequent reason horses never reach—or never get back to—the level they were purchased for.

My barn‑reality story
I once vetted a mare that checked all the boxes: brain, build, and training were exactly what I wanted. The ultrasound told a different story—hind proximal suspensory damage the seller waved off as “old and cold.” My vet wasn’t buying it, and neither was I. I walked away, and within a couple of years, that mare had bounced through several owners and never stayed in consistent work for long. The only money I “lost” was the PPE fee.

Cost implications

• Diagnostics quickly add up when you factor in ultrasound, nerve blocks, and sometimes advanced imaging.
• Rehab is long and expensive: months of controlled exercise, repeat scans, and therapies like shockwave or PRP.
• The second you ask that hind end to actually work, sprint, jump, collect, whatever, it usually falls apart again, and resale value usually takes a hit the minute “hind suspensory” is written in the file.

When it’s acceptable vs. not

• Acceptable: Very light‑use homes only, with clear ultrasound evidence of healing, a steep price reduction, and a buyer who truly understands they’re taking on a maintenance project.
• Not acceptable for the overwhelming majority of performance buyers: Racing, barrels, jumping, eventing, or any job where that hind end has to push, sit, and stay sound over time.

Clear action step

If hindlimb proximal suspensory damage shows up in a horse you want to run, jump, or compete on, treat it as a Category 1 finding and move on—you’re buying a rehab gamble, not a reliable partner.

Red Flag #3: Positive Drug Screen Without Disclosure

What it is
A positive drug screen without upfront disclosure means the horse has active medications in its system that you weren’t told about—anything from painkillers to sedatives. It’s not just the drug; it’s the fact that someone tried to mask how the horse truly moves or behaves when it’s not chemically helped. The drug screen typically checks for non-steroidal anti-inflammatory drugs (NSAIDs) like Bute (phenylbutazone) and Banamine (flunixin meglumine), as well as tranquilizers and sedatives like Acepromazine.​

Why it matters
A pre‑purchase exam is supposed to show you how the horse really moves and behaves so you and your vet can judge suitability and risk. When undisclosed drugs show up in the bloodwork, you have no idea what kind of lameness, anxiety, or behavior is being covered up—you only know there’s something the seller didn’t want you to see.

My barn‑reality story
I’ve jogged horses that felt almost suspiciously perfect—quiet, loose, and pain‑free in a way that didn’t match their age or history. More than once, bloodwork later came back glowing with medications the seller never mentioned. Every time that happened, the pattern was the same: pressure to hurry up and buy, vague answers about history, and a very different horse once those drugs wore off. The best money I spent in those deals was on the test that told me to walk.

Cost implications

• The immediate cost of a full drug panel is minor compared to buying a horse whose true soundness or temperament has been masked.
• Once the drugs clear, you may be facing surprise vet bills, behavior problems, or both—and good luck getting the seller to help at that point.
• You also step into an ethical and possible legal gray area if you later discover show‑rule or medication issues tied to the horse’s past.

When it’s acceptable vs. not

• Acceptable: Almost never; only if the drug is minor, the seller gives a believable, documented explanation, your vet is comfortable, and everything else on the exam and imaging is rock‑solid.
• Not acceptable: Any undisclosed pain meds, sedatives, or performance‑altering drugs in a horse being sold as sound and safe; that’s a character problem, not just a medical one.

Clear action step

If your drug screen pops positive for something the seller did not clearly disclose ahead of time, call it Category 1 and walk away—there are too many honest horses with honest people behind them to gamble on a rigged deal.

Red Flag #4: Severe Multi‑Limb Flexion Responses

What it is
Flexion tests stress specific joints or regions, then the horse is trotted off so the vet can see how it reacts. A mild response in an older, hard‑used horse can be normal. But when several limbs flex strongly positive, you’re looking at a body that’s sore in more than one place—and it’s telling you that loud and clear.

Understanding the Response: A normal response is often a slight hitch or two (Grade 1/5 lameness) that quickly resolves (within 2-3 strides). A severe response involves a pronounced limp (Grade 3/5 or worse) that persists for 10 or more strides. When a horse shows severe responses like “front right and both hinds flexing 3/5 lame for 15+ strides,” that is a classic Category 1 indicator. Often, one severe flexion is less concerning than multiple, persistent mild-to-moderate flexions, as the latter suggests systemic, widespread joint pain. This is why a horse can look “fine” jogging straight but fall apart during flexions—the stress test reveals what the eye can’t see.

Why it matters
Lameness‑related findings are the number‑one reason vets question a horse’s suitability for a buyer’s intended job. Strong, multi‑limb flexion responses often point to widespread wear‑and‑tear, joint disease, or multiple soft‑tissue problems waiting to blow up when you increase the workload.

My barn‑reality story
I’ve seen horses jog sound enough in a straight line, only to fall apart once the vet started flexing joints. One gelding in particular went from “a little stiff” to three‑legged sore when we flexed both hinds and a front. On paper he was a bargain; on flexions he was a walking liability. We passed, and within a year he was being marketed as a “pasture companion” after bouncing through a couple more barns.

Cost implications

• You don’t just chase one sore joint—you end up blocking, imaging, and sometimes scoping multiple areas to figure out what’s going on.
• Treatment often means injections in several joints plus ongoing anti‑inflammatories and shoeing changes just to keep the horse comfortable.
• In the long run, the odds of shortening that horse’s useful career and tanking its resale value are high.

When it’s acceptable vs. not

• Acceptable: Possibly in an older horse priced as a true light‑use or companion animal, where your expectations are low, your vet feels the reactions match age and history, and you’re not planning to do more than easy walk‑trot work.
• Not acceptable: Any horse I’d expect to stay sound doing real work, race, jump, or put into regular hard competition; severe multi‑limb flexion pain is tomorrow’s lameness showing up early.

Clear action step

If your vet finds strong positive flexion responses in more than one limb on a horse you expect to work or compete, put it firmly in Category 1 and let that horse be someone else’s retirement project.

Red Flag #5: Moderate Navicular Changes in Older Horses

Severity: 6/10 (Context-Dependent)

What It Is: Early navicular changes in horses 15 years or older—mild changes in bone density, small areas of remodeling, or slight alterations in bone shape that the veterinarian considers consistent with the horse’s age and work history.

Why It Matters: The key difference between this and Red Flag #1 is age and severity. A 15-year-old trail horse with mild navicular changes that isn’t currently lame might have years of useful work left with proper management. The condition is still progressive, but the horse has already proven he can handle it for 15 years. Compare that to a 7-year-old with severe changes who’s got his whole career ahead of him—completely different prognosis.

That said, you’re still taking on a management project. This horse will need specialized shoeing, possibly joint supplements or medication, and careful monitoring. The disease will progress, and at some point the horse may become too uncomfortable for riding.

Negotiation Strategy: If a horse is listed at $8,000 and has moderate navicular changes, I’m offering $4,000-5,000 maximum. That $3,000-4,000 reduction covers 1-2 years of management costs and accounts for the uncertainty of long-term soundness.

When It’s Acceptable: Light trail riding, pleasure riding, or companion work where the horse isn’t being asked for speed or sustained athletic effort. Not acceptable for jumping, eventing, competitive trail, or any discipline requiring soundness certification.

Red Flag #6: Left-Sided Laryngeal Hemiplegia (Grade 3 “Roaring”)

Severity: 7/10 for racing/eventing, 4/10 for lower-level work

What It Is: Laryngeal hemiplegia is when the left side of the horse’s throat doesn’t work right—that flap (the arytenoid cartilage) that’s supposed to pull back during hard work gets partially paralyzed. When the horse is running hard, that paralyzed side doesn’t open all the way, which blocks some of the airway. Makes a roaring sound you can hear clear across the track, and the horse can’t get enough oxygen when he’s really moving out. Grade 3 means it’s noticeable—you’ll hear it, and it’s affecting performance.

Why It Matters: According to the Shelton et al. 2025 study, respiratory findings affected 6.6% of horses in their PPE survey, with left-sided laryngeal hemiplegia accounting for 60% of those respiratory issues. That makes it one of the most common respiratory problems you’ll encounter during a PPE. The impact depends entirely on what you’re asking the horse to do. For racing or three-day eventing where maximum oxygen uptake is critical, even moderate hemiplegia significantly limits performance. For lower-level dressage or pleasure riding where speeds are moderate, the noise might be annoying but the horse can still do the job.

Negotiation Strategy: For horses intended for high-aerobic work (racing, eventing, endurance), negotiate $5,000-10,000 reduction to cover potential surgery costs and account for uncertain outcome. For lower-level work where the condition is manageable as-is, negotiate $2,000-4,000 reduction for the inconvenience and potential future limitations.

Red Flags #7-8: Suspensory Branch Lesions & Back/SI Pain

Suspensory Branch Lesions (Severity 6/10): Unlike proximal suspensory injuries, branch lesions occur in the lower portions near the fetlock. Better prognosis than proximal injuries, but still require 6-12 months rehabilitation with 40% reinjury risk. Negotiate $3,000-7,000 reduction depending on severity.

Back/SI Pain (Severity 5-7/10): Can range from mild muscle soreness (manageable) to kissing spine or SI arthritis (significant). Without proper diagnostic imaging, you don’t know which you’re dealing with. For jumping and dressage especially, a pain-free, flexible back is absolutely critical. Don’t negotiate until you have imaging showing exactly what you’re dealing with.

Red Flags #9-10: Age-Appropriate Changes & Minor Soft Tissue

Age-Appropriate Radiographic Changes (Severity 2-3/10): Minor arthritic changes, small osteophytes, or slight remodeling in joints that the veterinarian considers appropriate for the horse’s age and work history. Common in horses 15+ years old, especially those with competition backgrounds.

Minor Soft Tissue Thickening (Severity 2-4/10): Old soft tissue injuries that have completely healed, leaving behind some thickening or scar tissue. The key is confirming the injury is truly healed—no heat, no pain, normal ultrasound appearance aside from scar tissue, and good work history since the injury.

Discipline-Specific Considerations

One of the biggest mistakes buyers make is evaluating PPE findings without considering their specific intended use. A finding that’s a dealbreaker for racing might be perfectly manageable for trail riding. Here’s how to think about your discipline’s specific needs:

Racing: Zero tolerance for respiratory issues (including bleeders), suspensory problems, navicular disease, any upper airway compromise. High stress on lower limbs, respiratory system, joints—speed kills weak structures. Example: Suspensory repair runs $15,000-25,000 with poor racing prognosis.

Jumping/Eventing: Zero tolerance for hindlimb proximal suspensory, severe back problems, significant hock/stifle issues. Landing forces are 3-5× body weight per stride. Hindlimb power generates clearance—compromise there equals rails down or refusals.

Dressage: Zero tolerance for back/SI problems, hindlimb proximal suspensory. Collection means the horse sits on his hind end—any hindquarter weakness ruins half-halts. Laryngeal issues? Barely matters at dressage speeds.

Trail/Pleasure: Much higher tolerance for age-appropriate changes and managed conditions—comfort trumps performance. Focus on horse’s day-to-day comfort and your safety, not athletic potential. That 18-year-old with “ugly” X-rays but sound gaits? Perfect trail partner.

Breeding/Broodmare: Dealbreakers include multi-limb systemic issues (suggests genetic problems), undisclosed drug use (questions bloodline honesty). Acceptable: Minor lameness issues, age-appropriate changes, old injuries if healed—she’s not competing, just carrying foals. I’ve raised foals from mares who couldn’t compete anymore due to minor lameness—produced sound, athletic babies because the structural issues weren’t genetic.

When to Get a Second Opinion

Sometimes you need another set of eyes on a complicated case. Here’s when I always recommend getting a second opinion:

Unclear or borderline findings: When your veterinarian uses phrases like “could be concerning” or “hard to say” or “might be okay,” that’s your signal to consult a specialist or get another opinion.

High-dollar purchases: If you’re spending $30,000+ on a horse, the cost of a second opinion ($500-1,000) is negligible insurance.

Conflicting information: If the seller’s vet says one thing and your vet says another, bring in a neutral third party.

Complex cases requiring specialist knowledge: Upper airway issues might warrant a specialist endoscopy. Subtle lameness might need a veterinarian with advanced imaging capabilities.

Real Case Studies: Learning from Others’ Experiences

Frequently Asked Questions About Horse PPE Red Flags

“Important to remember: a PPE is a snapshot of the horse on exam day—not a crystal ball. Even a horse that passes with flying colors can develop problems tomorrow. What a PPE does is help you understand current risks and make informed decisions about whether those risks match your intended use and budget.”

Before you spend a dime on a pre-purchase exam, watch this. Dr. Erica Lacher shows you the subtle movement quirks and conformational red flags that scream ‘walk away’—often before the vet even pulls out the flexions.

Additional Resources

Related Articles:

• Horse Pre Purchase Exam Cost: What to Expect (Plus 7 Must-Ask Vet Questions) — Learn about the different levels of PPE and what each includes
• Need help preparing for the PPE itself? Check out our comprehensive Horse Pre-Purchase Exam Guide: What To Ask Your Vet for a complete body-systems checklist.

Professional Organizations:

• American Association of Equine Practitioners (AAEP) — Purchase Examination Guidelines
• Merck Veterinary Manual — Prepurchase Examination Resource

Research References:

• Shelton, K., et al. (2025). “Findings from 847 pre-purchase examinations of horses in the United Kingdom.” Equine Veterinary Journal, 57(1), 153-159. https://beva.onlinelibrary.wiley.com/doi/10.1111/evj.14061
• Guest, H., et al. (2025). “Suspensory ligament injuries: A comprehensive review.” Equine Veterinary Journal, 57(5), 1167-1182. https://beva.onlinelibrary.wiley.com/doi/10.1111/evj.14447
• Merck Veterinary Manual (2024). “Navicular Syndrome in Horses.” Updated October 2024.