Does my horse need salt?
Short answer
Yes, almost always. Forage (hay and pasture) is typically low in sodium, and most horses do not meet their sodium needs without added salt. A 500 kg (1,100 lb) horse at maintenance commonly requires around 30 grams (about 1 ounce) of salt per day, with needs increasing in heat, humidity, or during work.
Real-Life Example
It’s mid-summer and your horse is sweating during rides, but there isn’t much change in the salt block that’s in the paddock. Even though a block is available, some horses do not consume enough from a block alone to be adequate for their needs. Adding measured loose table salt to feed and offering free-choice loose salt, helps ensure intake matches demand, and helps avoid dehydration.
It Depends
Salt needs increase with:
• Heat and humidity - Horses lose more electrolytes through sweat in warmer conditions.
• Exercise and sweating - Work increases sweat loss, which raises sodium needs.
• Lactation - Nursing mares have higher fluid and electrolyte demands.
• Dry hay diets - Horses eating primarily hay often need additional salt to maintain proper hydration and electrolyte balance.
• Travel or stress - Both can increase fluid loss and alter hydration needs.
When to Seek Guidance
Consult your veterinarian if you notice:
• Reduced water intake
• Dry manure or signs of mild colic
• Unusual or exaggerated lethargy during heat
• Excessive sweating with slow recovery
Sources:
Lawrence L. (2022). The nutrient requirements of horses: historical perspectives.
Mad Barn – Equine Sodium & Salt Requirements
ECIR Group guidance - sodium intake in metabolic horses
