Worth Their Salt?
Written for Dallas Dressage Club Summer 2026 Newsletter
Worth Their Salt: Does Your Horse Need Salt or Electrolytes?
With this being our summer edition (and with all of us firmly trapped in the annual Texas inferno), I wanted to explore a weather related topic. Most Texas horse folks are already familiar with the fundamentals of preventing heat stress* and cooling an overheated horse, so rather than repeat the usual summer care checklist, I wanted to dig into a less obvious question: Does every sweaty horse actually need a commercial electrolyte supplement?
We know sweating is a horse’s primary means of dissipating heat in hot conditions. Unlike our human sweat, equine sweat contains a particularly high concentration of electrolytes, making appropriate replacement genuinely important. However, the amount lost, and therefore what needs to be replaced, depends greatly on how much and how frequently the individual horse is sweating.
Until recently, I was firmly in the year-round electrolyte camp. I routinely supplemented all my personal and client horses, regardless of season or workload, assuming that providing electrolytes was simply good management. However! Recently I listened to an episode of The Equine Connection Podcast featuring my equine nutritionist friend, Dr. Nicole Rambo, and that discussion challenged my long-held habit. So now you are all being subjected to my newest rabbit hole!
The episode highlighted an important distinction that is easily overlooked: most horses need salt every day, but not every horse needs a commercial electrolyte supplement. So, how do you know the difference?
What Does Salt Provide?
Plain salt, or sodium chloride, supplies two essential electrolytes: sodium and chloride. These minerals help support normal fluid balance, nerve and muscle function, and the horse’s drive to drink.
Forage naturally contains relatively little sodium, so most horses require an additional source of salt regardless of the season. A salt block can help, but many horses do not consume enough from a block to meet their needs. In addition, many mineral and salt blocks marketed for livestock are formulated primarily for cattle and may be too hard or unpalatable for horses, even further limiting intake.
Alternatively, offering loose salt allows for more reliable intake- although the appropriate amount should be determined based on the horse’s complete diet and individual needs. Resources for determining an appropriate amount are included below.
So, When Are Electrolytes Appropriate?
Horse sweat contains more than just sodium and chloride. It also contains potassium, calcium, and magnesium. When a horse sweats heavily and repeatedly, replacing only sodium and chloride may not fully address those losses.
A properly formulated electrolyte supplement may be beneficial for horses that are: performing moderate or strenuous work routinely, sweating heavily or for prolonged periods, and competing/traveling/experiencing other situations that increase sweat loss.
Our hot weather alone, however, does not necessarily mean every horse requires a daily commercial electrolyte. A horse resting in a stall or turnout and sweating lightly from the heat has different needs from a horse completing a demanding schooling session or competing through a hot Texas weekend and getting lathered.
So, it’s important to note that the need for additional electrolytes is driven primarily by the amount and frequency of sweat loss, not simply by the temperature on the weather app.
Electrolytes Are NOT Hydration
Electrolytes help the body maintain fluid balance, but they cannot replace the water lost through sweat. Giving concentrated electrolytes to a horse without adequate access to water can potentially worsen dehydration and create bigger problems.
If electrolytes are added to a horse’s water, plain water must also be available. It is important to remember that some horses dislike flavored or supplemented water and may drink less, or even refuse it altogether. Therefore, while flavored products can be useful for encouraging a horse to drink, flavored or supplemented water should never be the horse’s only available source of fluid. They need unlimited access to clean drinking water at all times.
Outside of scooping into water buckets, electrolytes can also be gradually introduced to feed. Top dressing feed is my preferred delivery method because I can confirm that the horse is actually consuming the product. We just need to confirm that the horse is still drinking adequate amounts of water in addition to our supplementation.
Electrolyte pastes are another option, although they are generally more expensive than granular products added to feed, but similar to granular products we can ensure the horse is consuming the supplementation. Paste is something I keep on hand for occasional situations outside our usual routine such as: long trailer rides, competitions, or particularly strenuous training sessions.
On that note, never wait until a competition, clinic, or long trailer ride to discover that your horse considers your chosen electrolyte a personal betrayal and stops eating or drinking altogether.
Read Beyond the Front of the Label
Commercial electrolyte products vary considerably. Instead of relying on the promises printed most dramatically on the container, examine the ingredient list and guaranteed analysis.
Look for meaningful amounts of sodium, chloride, potassium, and magnesium. Also note added added sugars and the recommended serving size. A small amount of sugar may be included for palatability and does not automatically make a product inappropriate. However, the quantity deserves closer consideration for horses with insulin resistance, equine metabolic syndrome, or other dietary restrictions!
Your veterinarian or a qualified equine nutritionist can help evaluate a product in the context of your horse’s complete diet, workload, health, and sweat loss.
Salty Summary
For many horses, the starting point is refreshingly simple:
Provide unlimited fresh, clean, water always
Consider your year-round salt supplementation and do not assume that access to a salt block guarantees sufficient intake
Consider a balanced electrolyte product when work or other circumstances cause substantial or repeated sweating
Never treat electrolytes as a substitute for hydration! Electrolytes + dehydration can be more detrimental than electrolyte imbalance
Read the label and tailor supplementation to your individual horse.
Our horses’ nutritional needs do not begin and end with the temperature. Understanding the difference between daily salt needs and the electrolytes lost through heavy sweating help us supplement more intentionally, rather than reaching for an expensive scoop simply because it is August in Texas.
This article is intended for general educational purposes. Consult your veterinarian or a qualified equine nutritionist regarding your horse’s individual requirements.
Further Reading and Sources
University of Minnesota Extension, “Caring for Horses During Hot Weather”
Iowa State University Extension, “Electrolytes and the Exercising Horse”
“Oral Electrolyte and Water Supplementation in Horses,” Animals (2022)
“Exertional Heat Illness in Thoroughbred Racehorses,” Equine Veterinary Education *
The Equine Connection Podcast, “Electrolytes 101 for Horses”
*The listed resources include current guidance on cooling overheated horses