Oral Foreign Body in Horses: Grass Awns, Embedded Material, and Mouth Pain

An oral foreign body is any material that gets stuck in your horse's mouth and causes irritation, pain, or tissue injury. In horses, this can include sharp grass awns, foxtail seed heads, coarse hay stems, splinters, thorns, wire, or less commonly metal fragments. These materials may lodge in the lips, cheeks, tongue, gums, bars of the mouth, or roof of the mouth.

Some foreign bodies sit on the surface and cause short-term irritation. Others penetrate deeper and create ulcers, draining tracts, swelling, or infection. Plant material is especially frustrating because small awns can migrate into soft tissue and keep causing inflammation even after the visible sore seems minor.

This problem can look like a dental issue at first. A horse may quid, eat slowly, resist the bit, or lose weight. That is why a careful oral exam matters. Mouth pain has many causes in horses, and embedded material is one of the treatable ones your vet will want to rule in or rule out.

The most common cause is ingestion of sharp plant material. Foxtails, barley awns, bristle grasses, and other mature seed heads can become embedded in delicate oral tissues while a horse grazes or eats contaminated hay. Coarse stems, burrs, and thorny plant fragments can do the same thing.

Non-plant material is also possible. Horses may get splinters from chewing wood, or less commonly pick up wire, metal, or other debris mixed into forage or the environment. In some cases, a foreign body becomes trapped in an area already irritated by sharp dental points, ulcers, or bit-related trauma.

Risk rises when hay quality is poor, seed heads are mature and dry, pasture plants are not well managed, or a horse is eating quickly from rough forage. Horses with concurrent dental disease may show more dramatic signs because chewing is already uncomfortable.

Diagnosis starts with a history and physical exam. Your vet will ask about recent hay or pasture changes, quidding, weight loss, bit resistance, drooling, and whether the problem started suddenly. Because many mouth problems look alike, the exam needs to consider dental disease, ulcers, trauma, infection, and foreign material.

A complete oral exam in a horse often requires sedation, a full-mouth speculum, and strong lighting. That allows your vet to inspect the cheeks, tongue, gums, bars, palate, and back teeth safely and thoroughly. Small awns or splinters can be hidden in swollen tissue, under the tongue, or along the cheek folds.

If your vet suspects deeper penetration, abscess formation, or a tract extending into soft tissue, additional diagnostics may be recommended. These can include oral palpation, endoscopy, ultrasound, radiographs, or repeat examination after initial cleaning. The goal is not only to remove visible material, but also to find any retained fragments and assess how much tissue damage is present.

Prevention starts with forage quality. Check hay for foxtails, mature seed heads, sharp awns, burrs, and foreign debris before feeding. If a batch seems stemmy, harsh, or contaminated, stop using it and discuss safer forage options with your barn manager, hay supplier, or your vet. Pasture management matters too, especially in seasons when grasses dry out and seed heads harden.

Routine oral care also helps. Horses should have regular dental exams because sharp enamel points and other dental problems can create ulcers that make the mouth more vulnerable to further injury. If your horse suddenly resists the bit, quids, or develops bad breath, do not assume it is only a training issue.

Keep feeding areas free of wire, splintered wood, and trash. Slow, careful observation during meals can catch early warning signs before weight loss or infection develops. When in doubt, a prompt oral exam is often the safest way to prevent a small embedded problem from turning into a larger one.