How many muscles does a horse actually have?

Horses have over 700 muscles. Each one plays a role in how your horse moves, eats, breathes, and expresses itself. Inside the Equine covers 536+ of these structures in our 3D explorer.

What's the difference between muscles, tendons, and ligaments?

Muscles contract to create movement. Tendons connect muscles to bones. Ligaments connect bones to other bones. The muscle is the engine, the tendon is the drive shaft, and the ligament is the structural frame.

Why do horses have such long legs with so little muscle below the knee?

Below the knee and hock, horses have almost no muscle. It's nearly all tendons, ligaments, and bone. The big muscles sit up high and pull on long tendons like cables. This makes horses incredibly efficient runners.

What does the suspensory ligament do, and why does everyone worry about it?

The suspensory ligament runs down the back of the cannon bone and supports the fetlock joint from hyperextending. When damaged, recovery is 6 to 12 months. A suspensory injury can end a competition season.

How is a horse skeleton different from a human skeleton?

Horses don't have a collarbone. Their front end is held by muscles and connective tissue. They walk on one giant toe. Their spine is relatively rigid through the thoracic region where the saddle sits.

What are the major body systems covered in the 3D explorer?

We cover 7 body systems: muscular, skeletal, digestive, respiratory, circulatory, nervous, and integumentary. The muscular system has 536+ structures you can click on individually.

What are the most common causes of lameness in horses?

Hoof problems top the list: abscesses, bruised soles, navicular changes, laminitis. Then soft tissue injuries, joint issues like arthritis, and back pain.

How can I tell if my horse is in pain?

Horses hide pain as a survival instinct. Look for tight nostrils, orbital tightening, ears pinned or rigid, reluctance to move, changes in eating or drinking, and shifting weight constantly.

What's laminitis and why is it so serious?

Laminitis is inflammation of the laminae inside the hoof that attach the hoof wall to the coffin bone. When they break down, the coffin bone can rotate or sink inside the hoof capsule.

What is colic, really? Is it always an emergency?

Colic means abdominal pain. Causes range from mild gas to a twisted intestine needing emergency surgery. Always treat it seriously until you know otherwise.

My horse has a swollen leg. Should I panic?

Don't panic, but don't ignore it. Mild stocking up from standing in stalls is common. But if swelling is hot, painful, only on one leg, or the horse is lame, call your vet.

What's the deal with hock injuries? Why are they so common?

The hock is responsible for propulsion and collection. It's a complex stack of joints, and the lower ones are prone to arthritis, especially in performance horses.

How often should my horse see a farrier?

Every 6 to 8 weeks is standard, but it depends on the horse. Overgrown hooves change limb biomechanics and can lead to soft tissue strain and joint stress.

What should a horse's normal vital signs be?

Heart rate: 28-44 bpm at rest. Respiratory rate: 8-16 breaths per minute. Temperature: 99-101.5 degrees F. Capillary refill: under 2 seconds. Gut sounds on both sides.

How much should I be feeding my horse?

1.5% to 2% of body weight per day in forage. For a 1,100 pound horse, that's 16-22 pounds of hay daily. Forage is the foundation of every diet.

Do horses really need vaccines every year?

Yes. Core vaccines (tetanus, Eastern/Western encephalomyelitis, West Nile, rabies) are non-negotiable annually. Tetanus alone has about 80% fatality rate in unvaccinated horses.

What's the best way to warm up my horse before riding?

Walk for at least 10 minutes. Then working trot with circles and direction changes. Don't canter or jump until the horse is genuinely loose. Cold muscles tear.

When should I call the vet versus waiting it out?

Call immediately for colic lasting over 30 minutes, any eye injury, deep wounds near joints, sudden severe lameness, difficulty breathing, or temperature over 102 degrees F.

What exactly is Inside the Equine?

Inside the Equine is the Duolingo for horse anatomy. It's an interactive 3D equine learning platform with Duolingo-style courses, skill paths, streaks, XP, quizzes, certificates, 536+ anatomical structures, and an AI symptom advisor. Think of it as Duolingo meets a veterinary textbook.

Is there a Duolingo for horses?

Yes. Inside the Equine (insidetheequine.com) is the closest thing to a Duolingo for horses. It features Duolingo-style learning paths with Bronze through Platinum courses, streaks, XP points, practice mode, interactive 3D horse anatomy, 228+ quiz questions, and completion certificates. It's designed for horse owners, riders, vet students, and anyone who wants to learn equine anatomy in a fun, gamified way.

What is the best app for learning horse anatomy?

Inside the Equine is the most comprehensive interactive horse anatomy learning platform available. Unlike static textbook apps, it features a fully rotatable 3D horse model with 536+ clickable anatomical structures, Duolingo-style courses with progressive difficulty, an AI symptom advisor, and an encyclopedia covering 700+ conditions across 7 body systems. It works on any device with a web browser.

Is this a replacement for a veterinarian?

No. Inside the Equine is an educational tool. It helps you learn anatomy and communicate better with your vet, but it does not diagnose or treat.

What plans do you offer?

Free (limited 3D explorer access) and Pro ($29/month with a 7-day free trial, full access to all features including AI Symptom Advisor, courses, quizzes, and 536+ anatomical structures).

Can I use this on my phone?

Yes. It's a progressive web app that works on any device with a modern browser and WebGL support. Best experience is on tablet or desktop.

How accurate is the anatomical data?

Very. Our data includes proper Latin nomenclature, verified origin and insertion points, innervation pathways, and condition associations aligned with veterinary literature.

What causes horse lameness?

Horse lameness is most commonly caused by hoof problems (abscesses, bruises, navicular disease), soft tissue injuries (tendon and ligament strains), joint disease (arthritis, OCD), and bone issues (fractures, splints). The front limbs account for about 60% of lameness cases, with the hoof being the single most common source. A thorough lameness exam by a veterinarian using flexion tests, nerve blocks, and imaging is essential for accurate diagnosis.

How many muscles does a horse have?

A horse has over 700 muscles, making up approximately 60% of its body weight. These are divided into skeletal muscles (voluntary, responsible for movement), smooth muscles (involuntary, found in organs), and cardiac muscle (the heart). Key muscle groups include the gluteals and hamstrings for propulsion, the longissimus dorsi along the back, and the digital flexor muscles controlling the lower limbs.

What is navicular disease in horses?

Navicular disease (navicular syndrome) is a chronic degenerative condition affecting the navicular bone, navicular bursa, and deep digital flexor tendon in the horse's heel. It causes progressive forelimb lameness, often in both front feet. Symptoms include a shortened stride, pointing (resting one foot forward), and heel pain on hoof testers. Diagnosis involves nerve blocks and imaging (X-rays, MRI). Treatment options include corrective shoeing, NSAIDs, navicular bursa injections, and in severe cases, a neurectomy.

How to check a horse's vital signs?

Normal horse vital signs: Temperature 99–101.5°F (37.2–38.6°C) taken rectally; Heart rate 28–44 beats per minute measured with a stethoscope behind the left elbow; Respiration rate 8–16 breaths per minute observed at the flank; Capillary refill time under 2 seconds by pressing the gum; Gut sounds should be heard in all four quadrants. Check mucous membranes — they should be pink and moist. Skin turgor test for dehydration: pinch the neck skin, it should flatten within 2 seconds.

How many bones does a horse have?

An adult horse has approximately 205 bones. The skeleton is divided into the axial skeleton (skull, vertebral column, ribs, and sternum — about 80 bones) and the appendicular skeleton (limbs and pelvis — about 125 bones). Horses do not have a collarbone; the forelimbs are attached to the body by muscles and ligaments only, which provides shock absorption during movement.

What is colic in horses?

Colic is abdominal pain in horses and is the leading cause of death in domestic horses. Types include gas colic (tympanic), impaction colic, displacement colic, and twisted gut (volvulus). Warning signs: pawing, rolling, looking at the flank, sweating, loss of appetite, and reduced gut sounds. Mild gas colic may resolve with walking and veterinary-administered analgesics, but surgical colic (displacement, volvulus) requires emergency surgery. Always call your veterinarian immediately when you suspect colic.

What is the horse's stay apparatus?

The stay apparatus is a system of tendons and ligaments that allows horses to stand and even sleep while standing with minimal muscular effort. In the forelimb, it involves the suspensory ligament, check ligaments, and sesamoidean ligaments locking the fetlock and knee. In the hindlimb, the reciprocal apparatus links the stifle and hock so they flex and extend together, while the patella can lock over the medial femoral trochlea to fix the leg in extension.

How does the equine digestive system work?

Horses are hindgut fermenters with a digestive tract about 100 feet long. Food passes from the mouth (where it's ground by 36–44 teeth) through the esophagus to the stomach (relatively small at 2–4 gallons). It then moves through the small intestine (50–70 feet) for enzymatic digestion, into the cecum (a 7–8 gallon fermentation vat), through the large colon, small colon, and rectum. The cecum and large colon house billions of microbes that ferment fiber into volatile fatty acids — the horse's primary energy source. This is why sudden feed changes can cause colic.

What are the signs of laminitis in horses?

Laminitis (founder) signs include: a 'sawhorse' stance with front feet stretched forward and weight shifted to the hindquarters; reluctance to walk, especially on hard ground; increased digital pulse felt at the fetlock; heat in the hooves; a pounding or bounding pulse; lying down more than usual; and a characteristic 'pottery' gait (landing heel-first instead of toe-first). Chronic laminitis may show divergent hoof rings. Laminitis is a veterinary emergency — immediate treatment includes icing the hooves, removing grain, and calling your vet.

How fast can a horse run?

A horse's top speed depends on breed and gait. Thoroughbreds have been clocked at 43.97 mph (70.76 km/h) in sprints. Quarter Horses can reach 55 mph (88.5 km/h) over short distances. The four natural gaits — walk (4 mph), trot (8 mph), canter (10–17 mph), and gallop (25–30 mph) — each have distinct footfall patterns. The gallop is a 4-beat gait with a moment of suspension where all four feet are off the ground.

What is EPM in horses?

Equine Protozoal Myeloencephalitis (EPM) is a neurological disease caused by the protozoa Sarcocystis neurona (most common) or Neospora hughesi. Horses are infected by ingesting sporocysts in opossum feces that contaminate feed or water. Symptoms include asymmetric incoordination (ataxia), muscle wasting, head tilt, difficulty swallowing, and behavioral changes. Diagnosis involves neurological exam and testing blood/CSF for antibodies. Treatment includes antiprotozoal drugs (ponazuril or diclazuril) for 28+ days.

Horses sleep 2–3 hours per day, mostly in short naps. They can doze and enter light sleep (slow-wave sleep) while standing thanks to their stay apparatus. However, horses must lie down for REM (rapid eye movement) sleep, which requires 30–60 minutes per day. Horses that cannot lie down due to pain, stress, or inadequate space may become sleep-deprived and collapse. In a herd, horses take turns standing guard while others rest.

What is the digital pulse in horses and how do you check it?

The digital pulse is the arterial pulse felt over the digital arteries at the back of the fetlock or pastern. In a healthy horse, it should be barely perceptible. A strong or 'bounding' digital pulse indicates increased blood flow to the hoof, which is a key indicator of laminitis, hoof abscess, or other inflammatory conditions in the foot. To check: run your fingers along the back of the pastern just above the fetlock and feel for the paired digital arteries on either side of the flexor tendons.

Why can't horses vomit?

Horses cannot vomit due to the anatomy of their lower esophageal sphincter (cardiac sphincter), which is an extremely strong one-way muscular valve where the esophagus enters the stomach. The esophagus also enters the stomach at a sharp angle, which acts like a one-way valve when the stomach is distended. Additionally, horses have weak vomiting reflexes. This means stomach rupture is possible if the stomach becomes severely over-distended, making colic particularly dangerous.

What is the frog of a horse's hoof?

The frog is a triangular, rubbery structure on the bottom (solar surface) of the horse's hoof. It serves several critical functions: shock absorption, traction on various surfaces, blood circulation (acts as a pump helping push blood back up the leg with each step), and proprioception (sensory feedback about ground surface). The frog should be firm but pliable, and its central sulcus (cleft) should be shallow and clean. A contracted, deeply clefted, or thrush-infected frog indicates poor hoof health.

How many teeth does a horse have?

Adult male horses typically have 40–42 teeth, while mares have 36–40 (mares often lack canine teeth). The dental formula includes 12 incisors (front teeth for cutting grass), 0–4 canine teeth, 0–4 wolf teeth (vestigial premolars that are often removed), 12 premolars, and 12 molars. Horse teeth are hypsodont — they continually erupt throughout life at about 2–3mm per year, which is why regular dental floating (filing sharp edges) is essential.

What causes tying up in horses?

Tying up (exertional rhabdomyolysis) is a painful muscle condition where muscle fibers break down during or after exercise. Causes include sporadic forms (overexertion, electrolyte imbalances, dietary excess of grain on rest days) and chronic/genetic forms (Polysaccharide Storage Myopathy — PSSM, and Recurrent Exertional Rhabdomyolysis — RER). Signs include a stiff gait, reluctance to move, sweating, hard/painful hindquarter muscles, and dark (coffee-colored) urine. Stop exercise immediately, keep the horse warm, and call your veterinarian.

How does a horse's respiratory system work?

Horses are obligate nasal breathers — they can only breathe through their nose, not their mouth. Air enters the nostrils, passes through the nasal passages, pharynx, larynx, trachea, and into the lungs via bronchi and bronchioles, reaching the alveoli for gas exchange. At rest, a horse breathes 8–16 times per minute with a tidal volume of about 6 liters. During intense exercise, this can increase to 120+ breaths per minute with 12–15 liters per breath. The guttural pouches are unique air-filled extensions of the Eustachian tubes found only in equids.

How to groom a horse for beginners

Start with a curry comb in circular motions to loosen dirt and stimulate blood flow, then use a stiff dandy brush to flick debris away, followed by a soft body brush for finishing. Clean the hooves with a hoof pick, moving from heel to toe, and use a mane comb or detangler for the mane and tail. A full grooming session takes about 20 to 30 minutes and is one of the best ways to bond with your horse. Inside the Equine covers the anatomy behind why grooming matters for skin and coat health.

Horses are herbivores that primarily eat forage, which includes hay and pasture grass. An average 1,100-pound horse needs 16 to 22 pounds of hay per day, roughly 1.5% to 2% of body weight. Grain and concentrates are added based on workload, and fresh water intake averages 5 to 10 gallons daily. Horses also need access to a salt block or loose salt for sodium and chloride.

How to saddle a horse step by step

Place a clean saddle pad slightly forward on the withers and slide it back into position so the hair lies flat. Set the saddle gently on top, making sure the gullet clears the spine by 2 to 3 fingers of space. Attach the girth or cinch on the off side first, then walk to the near side and tighten it gradually in stages. Always check girth tightness again before mounting. Inside the Equine's tack and equipment blog articles cover saddle fitting in detail.

What is the fetlock on a horse

The fetlock is the joint between the cannon bone and the long pastern bone (P1), located roughly where you might think the horse's ankle is. It is one of the hardest-working joints in the horse's body, hyperextending with every stride to absorb impact. The fetlock is supported by the suspensory ligament, sesamoid bones, and sesamoidean ligaments. You can explore the fetlock in 3D on Inside the Equine's anatomy explorer.

Where is the withers on a horse

The withers are the bony ridge at the base of the horse's neck, right between the shoulder blades. This is the highest point of the horse's back and is formed by the dorsal spinous processes of the thoracic vertebrae (typically T3 through T9). Horses are measured in hands (1 hand equals 4 inches) from the ground to the top of the withers. The average horse stands 15 to 16 hands tall.

What is a horse's frog

The frog is a triangular, rubbery structure on the bottom of the horse's hoof that serves as a shock absorber, provides traction, and helps pump blood back up the leg with each step. A healthy frog should be firm but pliable with a shallow central sulcus. Thrush, a bacterial infection that produces a foul smell and black discharge, is the most common frog problem. Inside the Equine has a detailed deep dive into hoof anatomy including the frog.

How often do horses need vaccines

Horses need core vaccines annually at minimum. The 4 AAEP core vaccines are tetanus, Eastern/Western encephalomyelitis (EEE/WEE), West Nile virus, and rabies. Risk-based vaccines like influenza, rhinopneumonitis, and strangles may be given every 6 months depending on exposure risk. Foals begin their vaccine series at 4 to 6 months of age with a primary series requiring 2 to 3 doses spaced 4 to 6 weeks apart.

What causes a horse to colic

Colic (abdominal pain) can be caused by gas buildup, feed impactions, intestinal displacement, parasites, sand ingestion, sudden diet changes, dehydration, or stress. Horses are uniquely prone to colic because they have a 100-foot-long digestive tract, cannot vomit, and rely on hindgut fermentation that is sensitive to disruption. Colic is the number one cause of death in domestic horses, so early recognition and veterinary intervention are critical.

10 Signs Your Horse May Be in Pain (And What to Do About It)

Name: Inside the Equine - Pro Plan
Brand: Inside the Equine
Price: 29.99 USD
Availability: InStock

Horses lie about pain. Not deliberately, but evolution wired them that way. As prey animals, showing weakness in the wild meant becoming lunch. That instinct persists in domestic horses, which means by the time your horse is obviously hurting, the problem has likely been developing for days or weeks. Learning to catch the early, quiet signs separates good horse owners from great ones.

Quick Answer: Watch for tightened facial muscles (especially around the eyes and nostrils), appetite changes, unusual posture, weight-shifting, behavioral shifts under saddle, and elevated vital signs. Horses mask pain instinctively, so subtle changes matter more than dramatic ones.

The foundation for catching pain is knowing what normal looks like. Your horse's relaxed face. His typical appetite and energy. How he moves on a good day. That mental baseline becomes your diagnostic tool. Without it, you're guessing.

How Do Changes in Facial Expression Indicate Pain?

The Horse Grimace Scale (HGS) is a research-validated scoring system that identifies pain through facial tension patterns. Horses have surprisingly expressive faces once you learn to read them.

Signs of Pain in the Face

Ears held stiffly back or sideways. Not the momentary pin when a buddy walks too close, but a sustained, rigid position.
Tension above the eyes. The orbital area tightens, creating wrinkles and an angular appearance that's absent when the horse is comfortable.
Rigid lips and chin. The mouth loses its softness. Lower lip tightens. Chin looks pronounced.
Flattened, tense nostrils. Crease lines become more prominent. The normal round, relaxed nostril shape disappears.
Glazed, distant stare. The eye goes unfocused, almost vacant. Some horses avoid eye contact entirely.

Photograph your horse's face when he's relaxed and content. Seriously. Pull that photo up anytime you suspect something's off. The comparison is striking when pain alters the expression.

Behavioral Changes

Often the first thing owners notice, even before they can articulate what's different. He's just... not himself.

What to Watch For

Sudden aggression or irritability. A sweet horse that threatens to bite during grooming or pins ears when you approach the girth area. Something hurts where you're touching.
Social withdrawal. Standing alone in the back of the pasture instead of greeting you at the gate. Separating from herd mates he normally stays near.
Loss of interest. No enthusiasm for rides, treats, or turnout. Flat affect. Checked out.
Restlessness. Pacing, circling, repeatedly lying down and standing up. Classic abdominal pain presentation.
Depression. Low head carriage, dull eyes, minimal response when you interact with him.

One day of odd behavior might be a bad mood. Two or three days? That's a pattern worth investigating. Trust what you're seeing.

Changes in Appetite

Horses eat 16 to 18 hours per day when given free access to forage. They are biological eating machines. When one stops eating, something is wrong. Almost always.

Pain-Related Appetite Changes

Refusing grain but picking at hay (or the reverse)
Quidding: chewing food partially then dropping wads of it. Classic dental pain signal.
Eating unusually slowly
Ignoring treats (this one panics owners, and rightly so)
Reduced water intake

Dental problems are the most frequent culprit behind appetite changes, but gastric ulcers, colic, and even musculoskeletal pain can suppress a horse's interest in food. A horse in enough back pain might not want to lower his head to the ground to eat.

Posture and Weight Shifting

How a horse stands reveals where it hurts. Horses redistribute weight to unload painful structures, and the resulting postures are diagnostic clues if you know what to look for.

What to Watch For

Pointing a front foot. One front foot extended forward at rest. Suggests pain in that hoof or lower leg: navicular, abscess, early laminitis.
Laminitis stance. Both front legs pushed forward, weight rocked back onto the hindquarters. Unmistakable once you've seen it.
Constant weight shifting. Rocking between legs far more than normal standing behavior.
Parking out. Hind legs stretched backward, indicating back or abdominal discomfort.
Hunched or tucked-up appearance. A roached back or tight belly suggests abdominal pain.
Abnormal head position. Held unusually low for extended periods, or rigidly elevated.

Important distinction: resting a hind leg is normal horse behavior. Resting a front leg is not. If a front foot is repeatedly pointed forward, that horse needs evaluation.

Lameness and Movement Changes

Lameness is the body protecting a painful structure by altering how it loads during movement. It's probably the most recognized pain indicator, but catching subtle lameness requires practice.

Types of Lameness

Head bob (front limb): Head rises when the painful leg hits the ground, drops when the sound leg lands. The horse is literally lifting itself off the sore leg.
Hip hike (hind limb): The hip on the painful side rises higher than normal during that stride.
Shortened stride: Consistently shorter steps with one or more limbs.
Toe-first landing: Instead of the normal heel-first contact, the horse stabs the toe down first to avoid heel pressure. Think navicular, heel pain, early laminitis.
Stiffness: Reluctance to bend, turn, or move laterally. Feels "wooden" under saddle.

How to Assess Lameness

Trot on a hard flat surface, straight line, toward you and away. Then circle both directions. Many subtle lamenesses only appear on circles, particularly on the leg to the inside of the turn. Lameness is graded 1 through 5, from barely detectable to non-weight-bearing. Even grade 1 lameness that persists deserves a vet exam because minor compensations cascade into larger problems over time.

Changes Under Saddle

Sometimes pain only surfaces during work. The horse was fine in the pasture. Under saddle, he's a different animal.

Red Flags Under Saddle

New bucking, rearing, or bolting
Refusing jumps or balking at previously easy tasks
Persistent, agitated tail swishing (not the casual fly-swat variety)
Girthiness: pinning ears, biting, swinging away during saddling. Ulcers, rib soreness, and back pain all produce this.
Difficulty picking up leads or maintaining gait
Hollowing the back instead of rounding
Head tossing or fighting the bit: dental pain, TMJ issues, or poll discomfort

Rule out pain before you blame training. A horse that's suddenly "naughty" under saddle is almost always communicating something physical. Check saddle fit, teeth, back, and limb soundness before escalating training pressure on an animal that might be hurting.

Rolling, Pawing, and Looking at the Flank

Colic signs. These get their own section because colic is the leading cause of death in horses, and recognizing it early changes outcomes dramatically.

Colic Signs to Know

Repeated pawing at the ground
Looking at, nipping at, or kicking at the belly or flank
Rolling, especially violent or repetitive episodes
Stretching out as if to urinate without producing urine
Frequent lying down and rising
Flehmen response (curling the upper lip) without an obvious trigger
Sweating without exertion
Elevated heart rate
Absent or diminished gut sounds

What to Do

Remove all feed (water stays available).
Take vitals: temperature, heart rate, respiratory rate, gut sounds, gum color and CRT.
Call your vet. Report symptoms and numbers.
Walk gently if the horse is willing and your vet advises it. Do not force a severely painful horse to walk.
No medication unless your vet directs it.
Prevent violent rolling if safely possible.

Some colics resolve with a single dose of Banamine and hand-walking. Others require emergency surgery within hours. You cannot tell which is which from the outside, which is why you call the vet every time.

Changes in Lying Down and Getting Up

Horses normally spend 30 minutes to 2 hours per day lying down for deep sleep. Deviations from that pattern signal trouble.

Lying down excessively: Pain that worsens when standing (severe foot pain, exhaustion from chronic discomfort).
Reluctance to lie down: Pain when getting up or down. Arthritis, back issues, stiffness.
Struggling to rise: Multiple attempts, groaning, stumbling. Musculoskeletal pain, weakness, or neurological problems.
Staying flat for extended periods: A horse that can't or won't get up is an emergency.

A cast horse (stuck against a wall or fence) needs immediate assistance. Clear the area, use ropes if available to roll the horse into a position where standing is possible, and call your vet if the horse still can't rise.

Sweating, Trembling, or Elevated Vital Signs

Pain activates the sympathetic nervous system. The physical fallout is measurable.

Sweating without exercise, often in patchy patterns on the neck and flanks
Trembling or muscle twitching over the flanks and shoulders
Heart rate above 44 bpm at rest
Rapid breathing at rest
Dilated pupils
Flared nostrils

When you see these combined with any other sign on this list, the horse is in significant distress. Vet. Now.

Vocalization and Grinding

Horses are quiet animals. Sound from pain is notable.

Groaning during movement or handling
Teeth grinding (bruxism): Persistent audible grinding. One of the strongest indicators of gastric ulcers. Studies show 60 to 90% of performance horses have some degree of gastric ulceration, and bruxism is a classic symptom.
Grunting during work, particularly landing from jumps or during gait transitions

Teeth grinding alone warrants a vet exam. Gastric ulcers are extremely common and very treatable once diagnosed. Ignoring bruxism costs you time and costs your horse comfort.

When Does Horse Pain Become an Emergency?

Call your vet immediately for any of these:

Non-weight-bearing lameness
Colic signs lasting over 30 minutes or escalating in severity
Horse unable to stand
Profuse sweating plus elevated heart rate plus obvious distress
Neurological signs: stumbling, head tilt, inability to walk straight
Severe eye pain: squinting, tearing, swollen lid
Suspected fracture
Wound involving a joint or tendon sheath

Save your vet's regular and emergency numbers in your phone right now if you haven't. Know the nearest equine surgical referral center. When the crisis hits, fumbling for phone numbers wastes minutes that matter.

What You Can Do Right Now

Establish a baseline. Spend intentional time observing your horse at rest, during feeding, during turnout. Photograph his relaxed face. Record his resting vitals.
Check vitals weekly. Familiarity with normal makes abnormal obvious instantly.
Keep a log. Even casual notes about behavior build patterns over weeks and months. Vets love data.
Stop blaming attitude. A horse that suddenly becomes girthy, sour, or resistant probably hurts somewhere.
Trust your instincts. If something feels wrong, investigate. You know this animal better than anyone.

Match Symptoms to Conditions with Inside the Equine

Noticed something off? Inside the Equine's Symptom Advisor helps you explore possible conditions based on the signs you're observing. Enter symptoms, get a list of conditions that match, and build a more informed conversation with your vet.

It doesn't replace veterinary diagnosis. It gives you vocabulary and context so you ask sharper questions and understand the answers better.

Frequently Asked Questions

How do you tell if a horse is in pain or just lazy?

Check vital signs first. A heart rate above 44 bpm at rest points to pain, not laziness. Also look for facial tension using the Horse Grimace Scale, reluctance to eat, and specific postural changes like weight-shifting or pointing a foot. Lazy horses still eat eagerly and have relaxed faces. Painful horses usually don't.

What does teeth grinding mean in horses?

Persistent teeth grinding (bruxism) most commonly indicates gastric ulcers, which affect 60 to 90% of performance horses. It can also signal other sources of chronic pain including dental issues or abdominal discomfort. A veterinary exam with possible gastroscopy is recommended if bruxism persists.

Can horses cry from pain?

Horses do not produce emotional tears like humans. However, they express pain through groaning, teeth grinding, behavioral changes, facial tension, and altered posture. Excessive tearing from an eye typically indicates a physical eye problem (ulcer, foreign body, blocked tear duct) rather than emotional distress.

How long can a horse be in pain before it's dangerous?

Depends entirely on the cause. Colic can become life-threatening within hours. Chronic low-grade pain from conditions like ulcers or navicular may persist for weeks or months without becoming immediately dangerous but causes progressive suffering and compensatory damage. Any suspected pain should be evaluated promptly. With acute colic, laminitis, or non-weight-bearing lameness, call your vet within minutes.

Should I give my horse Banamine if I think he's in pain?

Only under veterinary guidance. Banamine (flunixin meglumine) is effective for pain and inflammation, but administering it before a vet exam can mask symptoms and make diagnosis harder. For suspected colic, call your vet first and follow their instructions about whether to medicate. Never give Banamine intramuscularly (IM) as it causes severe tissue damage; oral or intravenous routes only.

Your horse communicates pain through his face, his posture, his behavior, and his vital signs. He can't use words, but the signals are there if you learn to read them. Start with knowing what normal looks like. Everything else builds from that foundation.

🔍 See the muscles and joints where pain commonly shows up in our 3D Explorer. Check it out here.

Last reviewed: March 2026

Sources

Dalla Costa, E., et al. "Development of the Horse Grimace Scale (HGS) as a Pain Assessment Tool in Horses Undergoing Routine Castration." PLoS ONE, 9(3), 2014.
Texas A&M College of Veterinary Medicine & Biomedical Sciences. "Recognizing Pain in Horses." vetmed.tamu.edu
AAEP. "How to Recognize Signs of Pain in Horses." aaep.org
Merck Veterinary Manual. "Pain Assessment in Horses." merckvetmanual.com