Why Does My Horse Yawn? Normal or a Warning Sign

Name: Why Does My Horse Yawn? Normal or a Warning Sign
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Why does my horse yawn? In most cases, yawning is a normal comfort behavior. Horses yawn to stretch the jaw and neck, to relax after rest or exercise, and sometimes in response to another horse yawning nearby. It becomes a warning sign when it shows up with pain, stress, or drug effects.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

A single yawn after turnout, feeding, or a nap is usually normal and needs no treatment.
Yawning is rare in herbivores like horses compared with people, so frequent yawning deserves a closer look [1].
Yawning can be contagious between horses, especially among pasture mates with good relationships [2].
Yawning paired with pawing, flank watching, rolling, or not eating points toward colic and needs a call to your vet.
A tight noseband can physically block a horse from yawning and other normal mouth behaviors, so check your tack fit [3][4].

What Yawning Looks Like in Horses

A horse yawn is easy to miss if you are not watching. The horse opens the mouth wide, often tilts the head slightly, and stretches the jaw and tongue. Some horses curl the upper lip or hold the mouth open for a second or two before closing it.

Researchers studying horses on pasture identified two yawning shapes: one with the mouth covered and one with the teeth uncovered. These two forms use different facial muscles, which tells us a yawn is not a single fixed reflex [2]. That matters for owners because a horse may yawn in slightly different ways depending on what it is doing at the time.

Yes, horses can yawn. It is a real behavior in both domestic horses and Przewalski horses, the wild relatives of the modern horse [1]. So if you see your horse yawn, you are not imagining it, and you are not seeing something strange for the species.

Normal Reasons Horses Yawn

Relaxation and the transition from rest

Many horses yawn when they wake up, after a nap, or during quiet time in the stall. The yawn looks like a full-body stretch for the head and jaw. This is the most common reason owners notice yawning, and it rarely means anything is wrong.

Social signaling between horses

Yawning spreads between horses. In one study of 48 horses on pasture, mares were more likely to yawn after seeing another horse yawn, and the effect was strongest between horses that shared good relationships [2]. Horses responded faster to yawns from relatives, and related horses that groomed each other responded fastest of all [2]. This suggests yawning helps horses sync up their behavior as a group [2].

Stress and social tension

Yawning is not always about being calm. In Przewalski horses, yawning frequency rose along with aggressive behavior, which suggests yawning can also show up when social stress is high [1]. If your horse yawns a lot around feeding time, during herd changes, or when a new horse joins the group, stress may be part of the picture.

A blocked or uncomfortable mouth

A horse cannot yawn normally if the mouth is physically restricted. Tight nosebands prevent horses from performing normal comfort behaviors such as coughing and yawning [3]. Research on noseband tightening found that when nosebands were fastened with no space underneath, horses showed changes in heart rate, heart rate variability, and eye temperature that indicate a stress response [4]. If your horse yawns constantly the moment you remove the bridle, the bridle fit may be the problem.

Medical Causes to Rule Out

Colic and abdominal pain

Colic is the big one. A horse with abdominal pain may yawn repeatedly, stretch out as if to urinate, paw, look at its flank, roll, or go off feed. Yawning by itself does not mean colic, but yawning with any of those signs is a reason to call your veterinarian right away. Learn the early signs in our guide to Horse Colic Early Signs and the full picture in Colic in Horses: Signs, Causes, and Prevention.

Gastric ulcers

Horses with gastric ulcers often show subtle signs: poor appetite, grinding teeth, girthiness, attitude changes, and sometimes yawning or lip smacking. Ulcers are common in performance horses and in horses with limited forage. Only your veterinarian can diagnose ulcers, usually with gastroscopy.

Sedation and medication effects

If your horse was recently sedated for a dental exam, sheath cleaning, or clipping, yawning and lip smacking are expected as the drug wears off. Some medications can also cause yawning. Tell your vet about any yawning that starts within hours of a procedure or a new medication.

Pain elsewhere

Jaw pain, dental disease, a foreign body in the mouth, or a sore neck can all change how a horse opens its mouth. If yawning looks stiff, one-sided, or painful, have your vet examine the mouth and jaw.

When Yawning Becomes a Problem

A single yawn is not a problem. A pattern is. Ask yourself these questions:

Is the yawning new, or has your horse always done it?
Is it happening more often than before?
Does it come with other signs, such as not eating, lying down more, or acting uncomfortable?
Does it happen only when tack is on?
Does it stop when the trigger (stress, tack, sedation) goes away?

If the yawning is frequent, new, or paired with any change in eating, drinking, manure, or attitude, treat it as a medical question first. Behavior comes second.

What to Do: Step by Step

1. Check the basics first

Take your horse's temperature, pulse, and respiratory rate, and compare them with normal values. Our guide to Recognizing Normal Vital Signs in Horses walks you through how to do this safely. Also check manure output, water intake, and appetite. In hot weather, watch for heat stress, which can change behavior and attitude, as covered in Horse Heat Stress Signs.

2. Loosen the noseband and check tack fit

You should be able to fit at least two fingers under a noseband without force. A noseband with no space underneath is too tight and can trigger a stress response [4]. If your horse yawns a lot in the bridle, take the bridle off, let the horse yawn, and have a qualified fitter or instructor review your tack.

3. Increase forage and turnout

Horses are designed to eat small amounts all day. Long stretches without forage raise the risk of ulcers and stereotypies. Provide continuous access to hay or pasture when possible, and give your horse turnout time with compatible companions.

4. Support social contact

Since yawning spreads between horses with good relationships [2], a horse with no compatible pasture mate may be missing normal social input. Group or pair turnout, with safe fencing and slow introductions, supports natural behavior.

5. Keep a simple log

Write down when the yawning happens, what the horse was doing, and what else you noticed that day. A two-week log gives your veterinarian real information instead of a vague memory. Include photos or short videos of the yawn itself.

6. Schedule a dental and wellness exam

Mouth pain and dental points can change how a horse yawns and eats. A routine dental exam with sedation lets your vet look inside the mouth and check the jaw.

What Not to Do

Do not punish a yawning horse. Yawning is a comfort behavior and a possible pain signal. Punishment adds stress and teaches nothing useful.

Do not assume yawning always means your horse is tired or bored. In horses, yawning can reflect social tension [1] or physical restriction from tack [3].

Do not crank the noseband tighter to "keep the horse quiet." Tight nosebands restrict normal behaviors and trigger a physiological stress response [4].

Do not wait on colic signs. If your horse is yawning and also pawing, rolling, sweating, or refusing feed, call your veterinarian now. Colic can worsen quickly.

Do not self-treat with ulcer medications or sedatives. Doses depend on your horse's weight and health, and your veterinarian calculates the correct dose and treatment plan.

When to Call a Veterinarian or Behavior Professional

Call your veterinarian the same day if your horse yawns repeatedly and also shows any of these:

Not eating or drinking normally
Fewer or no manure piles
Pawing, flank watching, or lying down more than usual
Grinding teeth, girthiness, or a changed attitude under saddle
Yawning that started after sedation or a new medication
Yawning that only happens with tack on, even after you loosen the noseband

Call immediately, as an emergency, if your horse is rolling violently, sweating heavily, stretching repeatedly, has a bloated abdomen, or cannot stand comfortably. These are signs of serious colic.

Call a certified equine behavior professional if your veterinarian has ruled out medical causes and the yawning continues with stress, herd changes, or stall confinement. A behavior consultant can help you build a management plan around turnout, forage, and social contact.

Limitations and When to Contact a Veterinarian

Yawning alone is usually harmless, but it is never a diagnosis. Only a veterinarian who examines your horse can tell whether yawning is normal relaxation or a sign of pain, ulcers, or another problem. Individual cases need a veterinarian.

Red flags that mean call now, not later:

Yawning with colic signs (pawing, rolling, flank watching, no manure)
Yawning with a fever, sweating, or a rapid pulse
Yawning with drooling, dropping feed, or a swollen jaw
Yawning that continues for hours without stopping
Yawning that starts right after sedation and does not wear off as expected

For anything less urgent, such as a new yawning habit with no other signs, book a routine visit. Your vet can check vitals, teeth, and history, and decide whether bloodwork or a gastric exam is needed.

Frequently Asked Questions

Do horses yawn?

Yes, horses yawn. It is a normal behavior seen in both domestic horses and Przewalski horses, although yawning is less common in herbivores than in people and some primates [1].

Is it normal for horses to yawn every day?

A daily yawn or two, especially after rest or feeding, is usually normal. Daily yawning that is new, frequent, or paired with appetite or attitude changes is worth a veterinary exam.

How do horses yawn?

A horse opens its mouth wide and stretches the jaw, sometimes curling the lip or holding the mouth open briefly. Horses show at least two yawn shapes that use different facial muscles [2].

Can horses yawn because of stress?

Yes. Yawning frequency rose with aggressive behavior in Przewalski horses, which suggests social stress can trigger yawning [1]. Tight nosebands also block normal yawning and cause a stress response [3][4].

Can horses catch yawns from each other?

Yes. Horses yawn after seeing another horse yawn, and the effect is strongest between horses with good relationships and between relatives [2]. This contagious yawning may help a herd synchronize its behavior [2].

References

Investigating determinants of yawning in the domestic (Equus caballus) and Przewalski (Equus ferus przewalskii) horses. Die Naturwissenschaften, 2016.
Yawning in sync: implications for social cohesion in horses. Current zoology, 2025.
Commentary on MacKechnie-Guire et al. Measuring Noseband Tightness on the Lateral Aspect of the Horse's Face. Animals 2015, 15, 537. Animals : an open access journal from MDPI, 2026.
The Effect of Noseband Tightening on Horses' Behavior, Eye Temperature, and Cardiac Responses. PloS one, 2016.