Diarrhea can go from messy to dangerous fast. The priority is early veterinary involvement and controlling dehydration and electrolyte loss before the situation spirals.
Colitis refers to inflammation of the colon or cecum, and it can lead to sudden, severe diarrhea in horses. This condition is not only uncomfortable, it can become life-threatening due to dehydration, electrolyte loss, and systemic inflammation.
What Causes Colitis and Diarrhea?
- Sudden changes in diet or forage quality
- Stress, illness, hauling, or overexertion
- Antibiotic use or NSAID overuse
- Contaminated water or spoiled feed
- Bacterial, viral, or parasitic infections
Warning Signs
- Frequent, watery manure
- Fever and elevated heart rate
- Lethargy or signs of colic
- Dark or injected gums, prolonged capillary refill, or signs of shock
- Loss of appetite, dehydration, or weakness
When to Call the Vet
Any case of diarrhea lasting more than a few hours, especially with fever, dullness, or colic signs, should be treated as urgent. Horses can lose fluids and electrolytes rapidly, and early treatment dramatically improves outcomes.
Prevention Tips
- Make feed changes gradually over 7 to 10 days
- Keep water sources clean and uncontaminated
- Monitor manure consistency and appetite daily
- Prioritize consistent forage and turnout when possible
- Follow a vet-guided deworming and vaccination program
Why It Matters
Colitis can escalate fast. Knowing the warning signs, acting early, and staying disciplined about barn management can prevent some cases and reduce severity when issues do occur.
