A Horse’s Digestive System Has No Reverse Gear—And That Matters

Last updated: August 29, 2026

By: Miles HenryFact Checked

If you own horses long enough, you eventually see something that makes you ask: can horses vomit or throw up? The answer is no—not in the ordinary way people, dogs, and cats can.

In this guide, I explain why horses cannot vomit, what owners often mistake for vomiting, how choke is different, and what to do if you see something unusual.

Why Can’t Horses Vomit?

Horses simply are not built with the same ability to reverse the movement of food from the stomach back up through the esophagus. At the bottom of the esophagus, where it joins the stomach, horses have a very strong muscular valve called the lower esophageal sphincter. The angle of that connection and the position of the stomach also make backflow difficult.

That means food is designed to travel down into the stomach, not back out. It is one reason a horse cannot use vomiting as a pressure-release mechanism when the stomach is distended. The reason starts with how the horse’s digestive system is designed; I explain that process in more detail in my horse digestion guide.

What If Something Comes From a Horse’s Nose?

Food, saliva, foam, or fluid coming from a horse’s nostrils can look like vomiting, but it is not normal and should not be treated as an ordinary upset stomach. In many cases, it is associated with choke—an obstruction in the esophagus rather than material being expelled from the stomach. Severe digestive disease can also cause fluid to back up, so the source cannot be determined safely by appearance alone.

Do not try to decide at the barn whether the horse is “really vomiting.” Call your veterinarian. Material from the nostrils or mouth, especially with distress, repeated swallowing, coughing, or colic signs, deserves prompt professional attention.

Choke vs. Vomiting in Horses

In horses, choke usually means feed or another material has become lodged in the esophagus. The horse can still breathe, but it may struggle to swallow. Saliva and feed material can then run back out through the nostrils, which is why choke is sometimes mistaken for vomiting.

What may look like vomiting in a horse

What you may see	What it may indicate	Best next step
Feed, saliva, or foam from the nostrils; coughing; repeated swallowing; an extended neck	Possible choke or esophageal obstruction	Remove feed and water, keep the horse calm, and call your veterinarian
Colic signs with fluid or discharge from the nostrils or mouth	A serious digestive problem requiring veterinary assessment	Call your veterinarian promptly; do not give oral medication, feed, or water unless directed
A horse is uncomfortable but has no nasal discharge	Colic or another cause of pain may still be possible	Call your veterinarian for guidance and follow the directions provided

UC Davis and the American Association of Equine Practitioners advise calling a veterinarian for suspected choke, preventing the horse from eating or drinking while you wait, and avoiding attempts to clear the obstruction yourself or give oral medication unless directed. Read UC Davis’s choke guidance or the AAEP’s choke overview.

Why It Matters During Colic

The inability to vomit matters during some colic cases because a horse cannot normally relieve a buildup of gas or fluid in the stomach by throwing up. In a serious obstruction or stomach-distention case, a veterinarian may pass a stomach tube through the nostril to release gas or fluid and help assess the problem.

I learned this lesson the hard way after losing a horse during a severe colic episode. What stays with me is how quickly a horse can go from looking uncomfortable to being in real trouble. Since then, I have paid close attention to the small changes: pawing, looking at the flank, refusing feed, or simply acting different from normal. Those signs do not tell you the exact diagnosis, but they are enough reason to call the veterinarian and get guidance.

Gastric rupture is an uncommon but fatal complication of equine colic. The owner-level takeaway is not to diagnose the type of colic at home; it is to take signs of pain seriously and seek timely veterinary guidance. Merck Veterinary Manual notes that, because horses cannot vomit, a stomach tube can release gas or fluid that might otherwise contribute to stomach rupture.

What Should You Do If Your Horse Looks Like It Is Vomiting?

If you suspect choke, colic, toxin exposure, or another digestive emergency, call your veterinarian and follow the instructions you receive. What is appropriate for one horse can be wrong for another, especially when the cause of pain or nasal discharge is unknown.

1. Call your veterinarian promptly. Describe what you are seeing, when it began, whether the horse has eaten or passed manure, and whether there is nasal discharge.
2. Keep the horse safe and as calm as possible. Move people, loose equipment, and other horses out of harm’s way. Do not put yourself at risk around a painful or rolling horse.
3. Do not force anything by mouth. Do not give feed, water, supplements, or oral medication unless your veterinarian specifically directs you to do so.
4. Follow instructions about movement, feed, and water. Do not assume walking, withholding water, or any traditional response is right for every case.
5. Record useful information. Note the horse’s behavior, manure output, recent feed changes, access to grain or plants, and any treatments already given.

Not every digestive problem can be prevented, but steady daily management reduces avoidable risk. Keep feed storage secure, make feed changes gradually, provide reliable clean water and appropriate forage, and stay current with dental and veterinary care. For more practical information, see my guides to what to do when your horse colics, horse digestive problems, and feeding horses hay.

Frequently Asked Questions

Related Horse Digestive Health Guides

If you are working to understand horse feeding, colic, or digestive health, these related guides may help.