Bit & Bridle

Equine Choke

Other Names

  • Esophageal obstruction
  • Oesophageal choke
  • Oesophageal impaction

What is Choke in Horses?

Choke in horses — correctly termed oesophageal obstruction — is a condition where feed material or a foreign object becomes lodged in the oesophagus (the muscular tube connecting the mouth to the stomach), blocking the passage of food and saliva. Unlike choke in humans, which typically involves a blocked airway, equine choke is an oesophageal obstruction that does not immediately threaten the airway. However, it is a genuine veterinary emergency because it is extremely uncomfortable for the horse, and because material that the horse attempts to swallow backs up and can be inhaled into the trachea, causing aspiration pneumonia — a serious, potentially fatal complication.

“Horse choke” is searched approximately 880 times per month in the UK, reflecting how frequently this scenario confronts horse owners. It is one of the most common equine emergencies encountered by veterinary practices and is particularly prevalent in horses that eat rapidly, have poor dentition, or are fed dry supplementary feeds without adequate water.

What Causes Choke in Horses?

The vast majority of choke cases involve feed material — dry, coarse, or poorly chewed feed that clumps together and becomes lodged in the oesophagus, typically at the thoracic inlet (where the oesophagus enters the chest). Less commonly, foreign objects are responsible. The following are the most common predisposing causes:

  • Rapid eating (bolting): The most common cause. Horses that eat too quickly do not chew their feed sufficiently, swallowing large, inadequately moistened boluses that can obstruct the oesophagus. Competition at feeding time, feeding from the ground on hard surfaces, or simply a horse with a greedy character all contribute.
  • Poor dental condition: Dental abnormalities — sharp enamel points, wave mouth, missing or worn teeth — impair the horse’s ability to chew properly. Incompletely chewed feed is much more likely to cause choke. Regular dental examinations (at least annually, more frequently for older horses) are the most important preventive measure.
  • Dry feeds without adequate water: Feeds such as dried sugar beet pulp, nuts, or pelleted feeds that are fed dry and not adequately softened absorb moisture in the oesophagus and can swell and obstruct. Sugar beet pulp in particular is notorious for causing choke when fed without adequate soaking.
  • Eating too soon after dental work or heavy sedation: The horse’s ability to chew and co-ordinate swallowing may be impaired temporarily after dental procedures or during recovery from sedation.
  • Oesophageal disease: Strictures (narrowings) from previous choke episodes or other disease, diverticula, megaoesophagus, or external masses compressing the oesophagus all predispose to recurrent choke by impeding normal oesophageal transit.
  • Foreign bodies: Pieces of wood, apples, carrots, or other treats fed in excessively large pieces can occasionally cause obstruction, particularly in elderly horses with impaired dentition.

Signs and Symptoms of Choke in Horses

Choke has a characteristic and recognisable presentation:

  • Nasal discharge: The most distinctive sign — greenish-brown feed material mixed with saliva running from both nostrils. This occurs because the obstructed oesophagus backs up with feed and saliva, which eventually escapes via the nasal passages. This is the hallmark of oesophageal choke and distinguishes it from other causes of nasal discharge.
  • Distress and retching/gagging movements: The horse makes repeated efforts to swallow, extending and arching the neck. Some horses appear to retch or gag repeatedly.
  • Neck swelling: A visible or palpable swelling or bulge along the left side of the neck at the obstruction site may sometimes be seen, particularly in the lower cervical region.
  • Excessive salivation: Frothy saliva dripping from the mouth is common
  • Inappetence: The horse stops eating and shows no interest in feed
  • Distress and anxiety: The horse may be anxious, paw the ground, or show mild signs of distress
  • Coughing: If material is being aspirated into the airway, a productive cough may develop — an ominous sign of aspiration pneumonia risk
  • Decreased water intake: Swallowing is uncomfortable or impossible

Importantly, horses with choke can still breathe normally (unlike human choking), as the airway (trachea) is separate from the oesophagus and is not obstructed by the blockage.

Diagnosis

Diagnosis is typically straightforward based on the characteristic presentation:

  • Clinical signs: Bilateral nasal discharge of feed material combined with swallowing difficulties and the described behavioural signs is highly characteristic of oesophageal choke.
  • Nasogastric tube passage: Your vet will pass a nasogastric tube to confirm and locate the obstruction, and to attempt to break it down. Resistance to tube passage at a consistent point in the oesophagus confirms the location and nature of the obstruction.
  • Endoscopy: Oesophagoscopy with a flexible endoscope allows direct visualisation of the obstruction, assessment of oesophageal mucosal damage, and evaluation after the obstruction has been cleared. Important for assessing the degree of mucosal trauma and checking for oesophageal damage that might predispose to stricture formation later.
  • Radiography/ultrasound: May be used to assess the size and nature of the obstruction, identify oesophageal dilatation, and detect aspiration pneumonia if the horse has been coughing.

Treatment of Choke in Horses

Choke is a veterinary emergency. Do not attempt to manage it at home beyond the immediate first steps outlined below:

Immediate steps

  • Remove all feed from the horse immediately — stop any access to food or water
  • Keep the horse as calm and quiet as possible — stress increases swallowing attempts and aspiration risk
  • Do not attempt to force feed, give water through a drench, or push on the neck swelling
  • Call your vet promptly

Veterinary treatment

  • Sedation: Your vet will typically sedate the horse (detomidine or romifidine with or without butorphanol) to relax the oesophageal musculature, reduce the horse’s anxiety and swallowing efforts, and allow the head and neck to be lowered to reduce aspiration risk.
  • Nasogastric tube lavage: Warm water (or dilute oxytocin solution) is flushed gently through the nasogastric tube to soften and gradually break down the obstructing material. This must be done carefully to avoid forcing material deeper into the oesophagus or risking aspiration.
  • Repeated attempts: If the obstruction does not clear quickly, the process is repeated over multiple attempts, allowing time for the warm water to soften the blockage. Most chokes resolve within 30–120 minutes of treatment.
  • Oxytocin: Intravenous or intramuscular oxytocin can promote oesophageal smooth muscle relaxation, sometimes allowing spontaneous passage of the obstruction or making lavage more effective.
  • General anaesthesia: Occasionally required for obstructions that cannot be cleared under standing sedation, particularly foreign body obstructions. Endoscope-guided removal under GA may be needed in rare cases.
  • Post-clearance management: Once the obstruction is cleared, the horse should receive soft, mash or soaked feeds for 3–5 days to allow any oesophageal trauma to heal. NSAIDs may be prescribed. The horse should be monitored for signs of aspiration pneumonia (fever, cough, abnormal lung sounds) in the days following the episode.
  • Follow-up endoscopy: Recommended after resolution to assess oesophageal mucosal damage and check for stricture formation. Horses with significant mucosal trauma are at risk of developing strictures that predispose to recurrent choke weeks to months later.

Prevention of Choke in Horses

  • Regular dental care: Annual dental examination and rasping — more frequently for older horses or those with known dental disease. Good dentition is the single most important factor in preventing feed-related choke.
  • Soak sugar beet and dry feeds: Always soak dried sugar beet pulp for at least 12 hours (cubes) or 2 hours (shreds) before feeding. Soak pelleted feeds for horses known to be choke-prone. Never feed dry sugar beet or other hygroscopic feeds.
  • Slow feeder management: For horses that bolt feed, use slow feeder hay nets, place large smooth rocks in the feed bucket, spread feed thinly on a rubber mat, or use a commercial slow feeder device. Separate competitive horses at feeding time.
  • Always ensure water access: Horses should have constant access to clean water. A well-hydrated horse produces more saliva and is less likely to have feed issues in the oesophagus.
  • Feed appropriate sizes: Chop apples, carrots, and treats into appropriate pieces — do not give large whole fruits to elderly horses or those with dental issues.
  • Post-dental care: Do not feed dry hard feeds for 24 hours after dental work. Feed soaked feeds and allow the horse time to recover normal sensation and chewing coordination before returning to hard feeds.
  • Monitor for recurrence: Horses that have had one episode of choke are at higher risk of further episodes, particularly if the underlying cause has not been addressed or if oesophageal scarring has developed. Work with your vet and farrier to identify and address the root cause.

Prognosis

The prognosis for a single, uncomplicated choke episode that is treated promptly is excellent. Most horses recover fully with no long-term consequences. Prognosis becomes more guarded if:

  • The choke has been present for more than 4–6 hours before treatment — increasing the risk of oesophageal mucosal damage and subsequent stricture
  • Aspiration pneumonia has developed — this is the most serious complication of choke and requires intensive antibiotic therapy; mortality risk rises significantly
  • Oesophageal strictures develop — these predispose to recurrent choke and may ultimately require specialist management including oesophageal dilatation
  • Oesophageal rupture — a rare but catastrophic complication of prolonged, severe obstruction or forceful lavage

When to Call the Vet

Call your vet immediately if you suspect choke. Do not wait to see if it resolves on its own:

  • Feed-stained discharge from both nostrils
  • Repeated swallowing efforts or retching movements
  • Drooling and complete loss of interest in eating
  • Distress and neck-stretching behaviour after a feed

The sooner treatment begins, the less oesophageal damage occurs and the lower the aspiration pneumonia risk. Never try to resolve choke yourself by forcing water or food — this risks aspiration and worsening the obstruction.

Frequently Asked Questions

Will choke resolve itself without treatment?

Some mild choke episodes do resolve spontaneously, particularly if the obstruction consists of softened feed material that gradually absorbs saliva and passes naturally. However, you cannot reliably predict which cases will resolve without help and which will not — and the risks of delayed treatment (mucosal damage, aspiration pneumonia) are significant. Always call your vet promptly. The vet can assess whether to attempt conservative management (quiet rest, head lowered) for 20–30 minutes or to proceed immediately to lavage.

Can choke in horses be fatal?

Direct fatality from oesophageal obstruction alone is rare. The major life-threatening complication is aspiration pneumonia — inhalation of feed material and bacteria into the lungs during the choke episode or during treatment. This is a serious condition requiring intensive antibiotic therapy and carries a significant mortality risk if severe. Oesophageal rupture — very rare — is almost always fatal. Prompt treatment dramatically reduces both risks.

How can I prevent my horse from choking on sugar beet?

Always soak sugar beet fully before feeding — cubes need at least 12 hours, shredded sugar beet at least 2 hours. Never feed dry or inadequately soaked sugar beet pulp — it swells significantly when it absorbs moisture and has caused many choke cases when fed dry. Once soaked, discard any leftover after 12 hours in warm conditions to avoid fermentation. Use the soaking time as part of your stable routine rather than trying to speed it up.

Can choke cause lasting damage to the oesophagus?

Yes. Prolonged or severe obstruction causes pressure necrosis of the oesophageal mucosa. As this heals, fibrous scar tissue (stricture) can form, narrowing the oesophageal lumen permanently and predisposing the horse to recurrent choke. This is why post-choke endoscopy is recommended — identifying early stricture formation allows intervention (oesophageal dilatation, specialist management) before it becomes a chronic problem.