If you’ve been in Aiken longer than one summer, you’ve either dealt with sand colic firsthand or you know someone who has. The soil here is beautiful — it drains well, it’s soft on legs, and it’s a big part of why this place is what it is for horses. It is also relentless about working its way into a horse’s gut if you don’t actively manage it.
Dry summers make this worse. When pastures dry out, horses spend more time nosing around bare ground. When hay is dropped on sandy soil, they pick it up grain by grain. When water buckets sit in sandy paddocks and get knocked over, they refill with a slurry at the bottom. It adds up fast, and sand accumulation in the large colon isn’t dramatic until it suddenly is.
This post is specifically about what to do in summer turnout conditions — not a general overview of colic prevention, but practical, Sandhills-specific management for dry months.
Why the Sandhills Are a Particular Risk
The soil composition in and around Aiken is genuinely different from most of the country. We’re sitting on ancient coastal plain sediment, and the fine, silty sand here behaves differently than coarser arena sand. It’s light enough to suspend in water and stay there, which means it moves through the upper GI tract and then settles in the cecum and large colon — exactly where you don’t want accumulation.
A horse can ingest meaningful amounts of sand without any visible sign of it. You won’t see it in the manure most of the time. By the time you hear gut sounds change or see early signs of discomfort, accumulation may already be significant.
Horses most at risk during summer turnout:
- Horses on dry lots or partially bare paddocks
- Horses who are aggressive about cleaning up every last bit of hay
- Horses on limited forage who spend more time grazing bare ground
- Horses drinking from ground-level troughs or buckets that sit in sandy soil
- Young horses and easy keepers restricted from lush grass
Feed Management First
This is the biggest lever you have, and it’s also where most people underestimate the details.
Feed hay off the ground. I know you know this. But in summer, when pasture thins out and horses are spending more time at the hay pile, the stakes go up. A rubber mat, a slow-feed net hung at chest height, or a purpose-built hay feeder makes a meaningful difference. On my property, every paddock that sees summer dry-lot turnout has a mat or a net — no exceptions.
Slow-feed hay nets do double duty. They keep hay off the ground and they extend eating time, which matters for digestive health in horses that would otherwise bolt through their ration in under an hour and then go rooting around in the dirt. If you’re looking at hay net options, I’ve covered what I actually use and why in the barn essentials gear reviews on the blog — worth a look if you’re replacing worn-out equipment this summer.
Manage the area around water sources. This one gets overlooked. Horses paw and mess around their water troughs constantly, especially in heat. The ground around a trough in an Aiken paddock turns into a sandy soup. If your horse drinks, splashes, and then grazes or licks at the wet sand nearby, they’re taking in more than you’d expect. Elevating buckets slightly and keeping the area around permanent troughs cleared of deep sand accumulation helps.
Psyllium Protocol
Psyllium husk is the standard recommendation, and the evidence behind it is solid enough that I consider it non-negotiable for horses on sandy soil in summer. It works by forming a mucilaginous mass in the gut that mechanically carries sand along and out.
The delivery method matters:
Don’t feed psyllium daily. The gut adapts to it and stops responding. The research — and the consensus from most equine vets I respect — supports a cyclical protocol: one week on, three weeks off, rotating through the month. Some practitioners do five days on, three weeks off. The exact schedule matters less than the cycling.
Get psyllium into a horse who won’t take it. Some horses love the nutty flavor. Others refuse it. Mixing with a small amount of beet pulp or soaked hay pellets usually solves the problem. Psyllium-based commercial products formulated for horses (the powder-plus-supplement blends) can be easier to feed consistently than bulk psyllium, and they’re worth considering if compliance is the issue. I’ve got notes on a few specific products in the gear and product review section of the blog if you want comparisons.
Track your protocol on a calendar. It sounds obvious. But in a summer where you’re managing multiple horses, early morning rides, heat protocols, and competition prep, the psyllium week gets skipped. Write it on your barn whiteboard.
The Manure Float Test
This is the simplest monitoring tool available to you and most Aiken horse owners either haven’t done it or did it once and forgot about it.
Fill a large, clear ziplock bag or a clean bucket with fresh manure — six to eight balls is enough. Add water, seal the bag, and shake it. Let it sit for fifteen minutes. Sand will settle to the bottom.
A teaspoon or less over the full sample is acceptable background. A tablespoon or more is a problem. Anything approaching a quarter cup and you’re having a conversation with your vet today.
Do this monthly during summer. Take a photo each time so you have a comparison. It takes five minutes and it tells you more than guessing does.
Gut Sound Monitoring in Hot Weather
During Aiken summers, heat-related gut motility changes and sand accumulation can happen at the same time, and the symptoms overlap. Know your horse’s normal borborygmi — the gut sounds you hear with a stethoscope or your ear flat against their flank. Four quadrants, four sounds, each present and roughly equal.
In a horse accumulating sand, you may notice:
- Intermittent mild discomfort that seems to resolve and return
- Loose or inconsistent manure without an obvious dietary cause
- Decreased gut sounds in the lower left quadrant specifically
- A horse that seems “not quite right” — off feed slightly, quieter than usual, reluctant to work with their normal energy
None of these is diagnostic on its own. All of them together warrant a vet call.
What I Actually Do Here in Summer
My horses are in dry lots during the hottest part of summer — it’s easier to manage forage intake, track manure output, and keep them cool and comfortable than to manage grass on limited pasture in June heat. That means sand management is a year-round consideration and a particularly active one from June through September.
Every horse is on a rotating psyllium protocol tracked on a calendar in the barn. Hay is fed from nets hung at chest height or from rubber mats depending on the horse and their tendency to drag hay around. I do manure float checks every four weeks, more often if something seems off.
I also talk about equine gut health and nervous system regulation regularly on The Elevated Equestrian podcast — including how stress (from heat, competition prep, schedule changes) compounds digestive issues in horses who are already managing a physical load. If you’re dealing with a horse who seems to be both anxious and having intermittent digestive discomfort, that episode is worth your time.
The Short Version
Sand colic is preventable the vast majority of the time. It requires consistent management — not expensive management, not complicated management, but the kind that doesn’t take summers off.
Feed off the ground. Cycle psyllium. Float manure monthly. Keep an eye on water source areas. Know your horse’s gut sounds well enough to notice a change.
That’s it. The Sandhills are worth it — but your horse needs you to stay ahead of the sand.
If you’re in the Aiken area and want to talk through summer management for your specific horse — especially if you’re dealing with a horse who’s already had a sand colic episode or who shows recurring low-grade GI signs — reach out at /contact. I’m always happy to connect with local riders who are trying to do right by their horses.
