Quick answer: Electrolytes replace the sodium, potassium and chloride a horse loses through sweat. In an Australian summer a horse in work can sweat out 5 to 12 litres in an hour, so a formulated electrolyte added to drinking water or feed at label rates, with plain fresh water always on offer, keeps horses drinking, working and recovering. Never dose a concentrated mix to a horse that isn't drinking.
The rider's take: The first summer I had Banjo on agistment, he went off his water during a 40-degree week and I didn't pick it up until he was dull-eyed and backing off his feed. What I've learnt in fifteen years of keeping horses through western NSW summers is that the electrolyte bucket goes out before the heat hits, not after. And the plain trough stays full beside it, because a horse will often drink from one and turn his nose up at the other.
From roughly November through March, keeping a horse in work in Australia becomes a water management exercise. Once the paddock browns off and the mercury sits in the high thirties, the losses stack faster than most riders realise: a horse sweating through hot, humid work can lose 5 to 12 litres an hour, and endurance exercise in serious heat pushes toward 10 to 15 litres an hour. A 15-hand horse needs somewhere in the RSPCA's range of 30 to 50 litres a day just standing in a paddock, and a working horse in a heatwave can chase 55 litres or more. Hot months like these are when horse health quietly tips from routine care into damage control, and water is nearly always where it starts.
Sweat is where the problem hides. Equine sweat is hypertonic, meaning it carries more salt than the blood, and it drains sodium, chloride and potassium hardest. Pasture and hay are potassium-rich and sodium-poor, so a horse sweating day after day digs a hole that grass alone cannot fill. This is exactly why formulated horse supplements exist, and electrolytes are the one category I would not run a summer without. The loss isn't just salt on the coat: sodium drives the thirst response, and a horse that is short on it can stop wanting to drink precisely when drinking matters most.
One bottle does most of this work in my feed room: Electrolyte Liquid for Horses from Value Plus, an Australian owned and operated animal health manufacturer. It's an apple-flavoured concentrate of sodium, potassium and chloride with glucose added to aid absorption, which matters because the flavour gets fussy drinkers interested in the first place. For most horses, this is the summer bottle: it's the plain reliable option, not a flashy one.
Electrolyte Liquid for Horses by Value Plus, an Australian-owned animal health product in 1L, 5L and 20L sizes.
What do electrolytes do for horses?
The short version: they hold water where the body needs it and keep nerves and muscles firing. Sodium and chloride manage fluid balance outside the cells, potassium works inside them, and all three together keep gut function and muscle contraction steady through long hot days. A horse short on sodium has a blunted thirst drive. The reality is that dehydrated horses can slide further simply because the salt deficit tells them they aren't thirsty.
Horse riders are often surprised at how salty equine sweat is. Human sweat is mostly water; horse sweat is saltier than the blood, roughly three times the concentration of ours. That's why a horse that has been sweating heavily ends up with white starch lines down its shoulders and flanks. That crust is sodium and chloride leaving the body, and in a summer schedule of work every second day, the deficit builds faster than a salt block can fix. A block is fine for an idle horse. For a horse in work through an Australian summer, waiting at a block is not a plan.
Scale matters more than most riders think. Working sweat rates of 5 to 12 litres an hour in hot, humid weather add up quickly, and a horse that trains through a January afternoon has lost more than an easy ride from spring would take out of him in a week. Give the same horse a couple of hard days in the tack and his 30 to 50 litre daily baseline starts looking thin. In practice I plan water and electrolytes around the work calendar, not the weather forecast alone, because the two don't always match.
Are electrolytes good for horses?
Honestly: in hot-weather work, they're not optional, they're basic care. In mild weather with an idle or lightly ridden horse, most horses get by on good forage and a salt source, so I wouldn't push a supplement nobody needs. The honest middle ground for Australian horses in regular work is that summer-length seasons justify summer-length support. If your horse is sweating visibly several times a week between December and March, he falls on the yes side of this question.
Don't let anyone sell you fear, though. An electrolyte isn't a magic performance product, and over-supplementing has its own risks. Follow the label rates rather than eyeballing a capful, and never dose a concentrated mix into a horse that isn't drinking water, because concentrated salt into a dehydrated horse makes the problem worse, not better. Always provide plain fresh water alongside any electrolyte water. A horse wants free choice between the two, and most drink from each over a day.
Two situations deserve a proper caveat. If your horse is prone to ulcers, talk to your vet before adding anything to his routine; heavy electrolyte dosing on an empty stomach isn't sensible for him. And if you own a non-sweater, read the next section on anhydrosis before you reach for the bottle. For most horses, watch his manure, watch his water intake, and let both tell you when the balance is right.
One bonus point people miss: horses sweat through winter, too. A clipped horse in work sweats in June, loses salt in June and needs replacement in June. The need isn't seasonal to the weather calendar; it tracks the work calendar. So winter work spells still need daily attention, just usually at lighter rates.
How to give horse electrolytes
You have three options, and the first two do the job most days. In drinking water, which is the easiest habit to keep: dose per the label, and the apple flavouring helps acceptance. Over feed, which is the reliable option for horses that refuse anything that changes their water. Or syringed diluted into the mouth for a horse that needs replacing after travel, illness or a hard competition day: a watery dilution, never a thick paste.
For Value Plus's Electrolyte Liquid, the label gives clear volumes: mix into water, don't guess. The pattern is 40mL into two litres of water for light work, 60mL into three litres for moderate work, and 80mL into four litres for heavy sweat or travel. Ponies under 350kg get half the volume. Doubling up on the theory that more salt means faster recovery is exactly how you end up with an unsettled gut and a horse that goes off water, which is the opposite of the plan.
| Work level | Label dose | Mix into |
|---|---|---|
| Light work or mild heat | 40mL | 2L of water |
| Moderate work | 60mL | 3L of water |
| Heavy sweat or travel | 80mL | 4L of water |
| Ponies under 350kg | Half the above | Same dilution |
Get the sizes right for your yard. The 1L bottle at $24.10 AUD suits one horse through early summer, most agistment yards want the 5L at $88.50 AUD, and and the 20L at $336.50 AUD suits multi-horse yards. It sits on the shelf with the rest of the feed-room gear from our stable accessories range, and like any liquid concentrate it's best stored out of direct sun.
Electrolyte Liquid for Horses
from $24.10 AUD
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A vet examining a horse while the owner looks on. When dehydration signs stack up, get professional eyes on your horse fast.
Signs of dehydration in horses
These are rough guides, not diagnosis, and I say that plainly because the classic pinch test gets oversold. A skin tent test done on the neck or shoulder should snap back in a second or two; a slow return suggests the horse is behind on fluids. But skin varies with age, coat and condition, so a slow pinch alone tells you to look closer, not to panic.
Look at gums too. Tacky, dry gums and a capillary refill time over about two seconds when you press a thumb to the gum are more useful signals a horse may be dehydrated than any single sign. Eyes that look dull or slightly sunken, a dry muzzle, lethargy and a horse that walks off feed in the heat all belong in the same picture. None of them alone is diagnostic. Two or three together on a hot afternoon, and you treat the water first and the diagnosis second.
Practical habit worth stealing: on forecast heatwave days, fill both buckets morning and evening and measure roughly how much went. An easy check at the yard costs nothing and finds a problem a day earlier than the pinch test. A horse that hasn't touched water through a hot day but keeps eating is still a horse to watch closely; appetite dries up after fluid does.
When to call the vet
Some situations aren't feed-room fixes. A horse that's been off water through serious heat for half a day, a horse showing colic-like signs, one that's staggering or breathing hard, or one that's clearly getting worse rather than plateauing: that's a phone call, not a bigger bucket. Keep your vet's number handy, keep your first aid kit stocked, and trust me that the call costs less than the aftermath.
The one I want every Australian rider to know about is anhydrosis, the non-sweating horse. It's a real condition of hot, humid climates, including parts of Queensland and coastal NSW, and it's sneaky: the horse stops sweating but still overheats, so he can't cool himself at exactly the time it matters most. If you notice your normally sweaty horse working hard on a hot day with a dry coat, treat it as a veterinary conversation. Also treat it as a flag to check you've been replacing salts all season, because the two problems overlap.
A horse carrying a thick coat into an early-season heatwave is its own problem. Clipping before a November scorcher isn't vanity, it's welfare. My rule after fifteen years of these summers is simple: when two or more dehydration signs stack up in one horse on a hot day, call. And if you wouldn't drink the trough water yourself, clean it.
Frequently Asked Questions
Should I give my horse electrolytes every day?
Through an Australian summer, a horse in regular work can have electrolytes daily at label rates, especially on hot days when sweat losses are highest. Idle horses in mild weather usually need no more than a salt source and good forage. Scale it to work and weather, and ease off when the temperature does.
Can you put electrolytes for horses in water?
Yes, and it's the most common method. Dose per the label into the drinking water, and always offer a second bucket of plain fresh water so the horse has free choice. Many horses drink from both over the course of a day.
How to make electrolytes for horses at home?
Homemade mixes are common in endurance circles, but the ratios are where things go wrong: lite salt is mostly potassium, and Epsom salts alone miss the sodium and chloride entirely. An unbalanced mix can make a deficit worse. I don't publish a recipe for that reason, and I'd honestly steer most riders to a formulated product designed for horses.
Are electrolytes good for horses with ulcers?
There's no clean answer here, which makes it a vet conversation rather than a feed-room one. Heavy electrolyte dosing on an empty stomach is generally considered unwise for ulcer-prone horses, and your vet can advise on timing, buffering and whether it fits your horse's management at all.
Do horses need electrolytes in winter?
Yes if they're still sweating. A clipped horse in work sweats in June and loses salts in June, so the need tracks the work calendar more than the season. Idle horses spelled through winter usually manage on forage and a salt source.
What are the side effects of electrolytes for horses?
At label rates, side effects are uncommon. Problems come from overdosing, from concentrating the mix too hard, or from dosing a horse that isn't drinking. All three can put a horse off water or unsettle the gut. Follow the label, keep plain water on offer, and watch intake.
How do I know if my horse is dehydrated?
Look at gums, eyes and behaviour along with the skin tent test: tacky gums, a refill time over about two seconds, dull or sunken eyes, lethargy and going off feed all belong in the picture. None is diagnostic alone, but two or more together on a hot day means act on water first and call the vet if they don't improve.
Summer hydration, sorted
Stock the shelf before the heatwave hits. Electrolyte Liquid for Horses is the bottle we keep within reach, and it sits alongside the rest of our horse health and supplements ranges, delivered Australia-wide.
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