Colic — abdominal pain in horses — is the most common veterinary emergency in equine medicine and one of the most significant welfare emergencies a horse owner will encounter. Recognising colic early and responding appropriately can be lifesaving; delay can result in death.
Colic is a symptom, not a diagnosis — it means abdominal pain of any cause. The equine gastrointestinal tract is extraordinarily long (approximately 30 metres) and complex, with multiple points of vulnerability to obstruction, displacement, and torsion. Horses cannot vomit due to the strength of their cardiac sphincter, so gas and ingesta that would be expelled in other species must pass through or be removed medically or surgically.
Spasmodic colic: Intestinal spasm, most common and usually resolves with antispasmodic treatment. Moderate welfare impact, usually acute and self-limiting.
Impaction colic: Blockage of digesta, particularly at fixed points (pelvic flexure, caecum). May resolve with fluids and laxatives; severe cases require surgery.
Gas (tympanic) colic: Accumulation of fermentation gas, causing distension and pain. Varies from mild to severe.
Large colon displacement: The large colon moves from its normal position — right dorsal displacement ('nephrosplenic entrapment') or left dorsal displacement. Often requires surgical correction.
Strangulating obstruction: A section of gut loses its blood supply — large colon volvulus, small intestinal strangulation through a mesenteric rent, or lipoma strangulation. These are life-threatening emergencies requiring immediate surgery; welfare impact is severe and prognosis deteriorates rapidly with delay.
Key signs indicating colic: looking at the flank, pawing, repeated lying down and rising, rolling (particularly violently), kicking at the abdomen, sweating, increased respiratory rate, not eating, increased or decreased gut sounds. Vital signs: heart rate above 44bpm indicates moderate to severe pain or cardiovascular compromise. Any horse showing these signs requires immediate veterinary attention — do not wait to see if it resolves.
While waiting for the vet: remove food from the stable, monitor the horse continuously, record heart rate and respiratory rate, prevent violent rolling on hard surfaces (risk of injury), keep the horse calm and walking if moving helps them — but do not force exercise. Do not administer analgesics before the vet arrives unless instructed — masking pain prevents accurate assessment of severity. Do not administer oral fluids or mineral oil without veterinary guidance.
The attending vet's examination assesses pain severity (heart rate, sweating, behaviour), gastrointestinal motility (gut sounds), rectal examination of accessible bowel, nasogastric intubation to detect reflux (indicating small intestinal obstruction), and blood parameters. The decision to refer for surgery is based on: signs of cardiovascular compromise, reflux over 2 litres, absent gut sounds, rectal findings suggesting displacement or volvulus, and failure to respond to analgesic treatment within 1–2 hours.
Equine colic surgery under general anaesthesia carries significant risk but is lifesaving in strangulating cases. Post-operative management requires: IV fluids, analgesics, antibiotics, careful reintroduction of feed, monitoring for complications (ileus, endotoxaemia, peritonitis, laminitis), and extended rest and rehabilitation. Welfare during recovery requires appropriate pain management and monitoring.
Risk reduction includes: consistent feeding routines, gradual dietary changes, adequate long-stem fibre (forage-first diet), appropriate parasite control, dental care to maintain feed processing efficiency, adequate water access, and regular exercise. Sand colic risk is reduced by feeding from elevated racks rather than the ground in sandy environments.
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