Horse Colic: Emergency Signs, 7-Step Triage, and When Every Minute Counts

Last updated: February 6, 2026

By: Miles HenryFact Checked

If your horse is showing signs of colic, call your veterinarian immediately—then keep reading while help is on the way.

It was an hour before her scheduled race at Evangeline Downs when I went to check on Diamond Country, my three-year-old filly. She had already passed the mandatory pre-race vet check with flying colors, but now I found her drenched in a cold sweat and trying to cast herself against the stall wall. Her heart rate was pushing 80, and her gut sounds were dead silent.

Most owners wait to “see how they look”; on the racetrack, that wait is a death sentence. Because we hit the trailer in 20 minutes, she was tubed and stabilized before the impaction required a $12,000 surgery. She recovered so well that she ran second in a race just six weeks later.

I’m Miles Henry, Louisiana-licensed racehorse owner (License #67012). In 30+ years on the track, I’ve managed over 20 acute horse colic cases, from simple gas to “the twist.” I’ve seen the $20,000 surgical bills, and I’ve seen the burials.

Colic is the number one killer of horses, which underscores why rapid recognition and veterinary action matter. In my experience, early triage and prompt treatment dramatically improve outcomes, while hesitation increases the likelihood of surgery and loss.

If heart rate is elevated or gut sounds are silent, call your vet NOW.

Why Horse Colic Kills

According to the AAEP, colic accounts for approximately 10% of all equine deaths. Colic syndrome is also one of the most common emergency presentations veterinarians see. While most cases respond to appropriate medical management, a significant minority require referral and intensive care, and some require surgery.

Immediate veterinary evaluation essential when colic signs appear—delay increases the risk of intestinal damage, surgery, and death.

The Four Categories of Risk

1. Impaction Colic

An intestinal “logjam,” often at the pelvic flexure. Usually caused by dehydration or coarse roughage. Most impactions can be medically managed with fluids and tubing when caught early, but neglect can lead to dangerous intestinal damage.

2. Gas/Spasmodic Colic

Nerves, stress, or diet changes cause the bowel to fill with gas. The pain is violent and acute. Prognosis is excellent if treated early, but horses can self-injure if left untreated.

3. Sand Colic

Ingested grit settles in the large colon, irritating the lining and potentially causing displacements that require advanced veterinary care.

4. Displacement/Torsion – “The Twist” ⚠️ Surgery Risk

The nightmare scenario. A portion of the intestine twists, cutting off the blood supply. Gut tissue begins to die within 2–4 hours. Immediate clinical evaluation is the only way to save the horse.

A Note from the Author: What follows is my personal experience as a racehorse owner and trainer, not veterinary medical advice. Everything described here happened under direct veterinary supervision and care. Every horse and every colic episode is different—what worked for my filly may not be appropriate for your horse. The purpose of sharing my stories is to help you recognize signs and understand the urgency of veterinary intervention, not to provide treatment instructions.

Most colic cases respond to medical treatment, but about 8–20% require hospitalization and advanced care.

2025–26 Medical Updates: Better Detection & Gut Health

Advances in equine medicine and diagnostics over the past few years are changing how vets approach colic — especially in early detection and gut health. These developments don’t replace veterinary care, but they offer new tools and strategies that can improve outcomes when applied alongside expert evaluation.

Key clinical insights from recent research:

• AI Diagnostics: Research applying artificial intelligence to horses with acute abdomen (colic) found that machine learning models could predict the need for surgery and survivability with meaningful accuracy, pointing toward future decision-support tools for veterinarians. AI colic surgery prediction study
• Gut Microbiome & Probiotics: Scientific reviews highlight the role of gut microbial balance in equine colic risk and inflammation. While evidence specifically showing probiotics prevent colic remains limited and mixed, emerging understanding of gut microbiota pathways underscores why managing fiber and microbiome health matters.

These developments reflect a broader trend: blending technology, data, and traditional veterinary examination to catch serious colic earlier and support long-term gut stability.

What to Ask Your Vet

• Which lab tests or imaging options will you use early in a colic evaluation? (e.g., bloodwork, ultrasound)
• How should we adjust diet or management to support gut microbiome health?
• Does my horse need specific monitoring tools (like accelerometers or wearable behavior trackers)?
• What’s the best way to monitor hydration and fiber intake daily?

These questions help align the latest research with your horse’s care plan in a way that’s evidence-guided and individualized.

7-Step Horse Colic Triage Protocol

1. Contact your veterinarian immediately: Secure your professional assessment first, then proceed with on-site stabilization.
2. Pull all feed: Remove hay and grain. Keep water available unless instructed otherwise.
3. Check Gut Sounds: Use a stethoscope on all 4 quadrants. Silence is a critical indicator of a blockage.
4. Take Heart Rate: High pain is usually reflected in a pulse over 52 BPM.
5. Capillary Refill Test: Gums should return to pink in < 2 seconds. Purple/brick red indicates shock.
6. Banamine Administration (ONLY Under Vet Direction): Banamine masks pain for 8-12 hours. A horse that “looks better” may actually be deteriorating internally. Never dose before a vet evaluates the pain level.
7. Text Data to Vet: Send the HR, Temp, and Gut Sound status while they are en route.

Medical vs. Surgical Escalation

Understanding the difference between medical and surgical colic determines not just cost—but survival. Medical colic (impactions, gas) responds to tubing and fluids with 85-90% success rates. Surgical colic requires immediate referral to a hospital facility.

Racetrack Proof: 30 Years of Triage

The Diamond Country Case

Caught just an hour before her race with silent gut sounds and an HR of 80. We acted immediately—within 20 minutes she was on a trailer. Medical tubing resolved the impaction before surgery became necessary. Total cost: $1,800. She was back on the track, running second only six weeks later.

The Surgical Fail

Owner waited 4 hours to “see if he’d pull out of it.” By arrival, gums were purple. $15,000 surgery failed because the tissue had died.

The Trailer Trick

Used only after veterinary evaluation confirms gas colic. The vibration shifted the bubble. Never try this with a twist.

Critical Skills

1. Checking Gut Sounds Properly

Listen in the flank area. Gurgles and “ocean” sounds are normal. High-pitched pings mean gas; silence possibly means obstruction. This is why the emergency box flags silent gut sounds as an IMMEDIATE trigger.

2. Capillary Refill Test

Press the upper gum for 2 seconds. Return to pink should be <2 seconds. Abnormal colors indicate circulatory shock.

3. The 2 AM Kit Drill

Can you find your stethoscope and thermometer in the dark in 60 seconds? Audit your first aid kit monthly.

Managing the Gut

• Hydration: Add salt to feed to ensure water intake during seasonal shifts.
• Slow Feed Changes: Blend old and new grain/hay over 10 days.
• Parasite Control: Fecal counts prevent arterial blockages in the gut.

Seasonal Risk Management

• Winter: Heat water buckets. Impaction risk spikes during cold snaps when horses stop drinking chilly water while continuing to eat dry hay.
• Spring/Fall: Transition pasture grazing slowly (15–30 minutes at a time) to avoid rapid gut flora shifts that lead to gas colic.

Dr. Eric Mueller (University of Georgia/AAEP) explains colic mechanics with Glass Horse animations in this insightful YouTube video.

Frequently Asked Questions About Horse Colic