Why Is My Horse Eating Dirt? What I’d Check First

Last updated: August 17, 2026

By: Miles HenryFact Checked

When my granddaughter and I were watching our horses in a paddock, she noticed one eating dirt and asked me if it was normal. The short answer is that horses do eat dirt, and an occasional mouthful is not necessarily a problem. But a horse that repeatedly seeks out soil deserves a closer look.

This guide explains what geophagia is, the possible causes worth considering, when it becomes a real health concern, and what I’d check if one of my horses started doing it.

What Is Geophagia in Horses?

Geophagia is the deliberate eating of soil, a form of pica, which is the general term for eating non-food items. It’s been observed in both wild and domestic horses, so it isn’t purely a symptom of captivity or poor management. What’s genuinely interesting is that geophagia looks like an individual preference as much as anything else: researchers have documented horses in the same pasture, eating the same feed, where some regularly seek out dirt and others never do. That’s part of why the behavior isn’t fully explained by any single cause.

Why Do Horses Eat Dirt?

Mineral or salt deficiency. This is the explanation most people reach for first, and there’s real evidence behind it, though it’s not the whole picture. A published study comparing soil from sites horses actively sought out against nearby control soil found the preferred sites had meaningfully higher iron and copper content, suggesting horses may be seeking specific minerals.¹

Separately, horses that eat dirt have been shown to sometimes have lower serum iron and copper levels than herd mates that don’t. It’s a real pattern, but researchers are careful to note they can’t fully separate cause from effect: does mineral deficiency drive the dirt-eating, or does dirt-eating somehow contribute to the deficiency? If one of my horses started eating dirt, I’d make sure his diet was actually meeting his salt and trace-mineral needs before looking for more complicated explanations.

Salt and mineral intake. It’s sensible to make sure a horse has access to plain salt and is on a diet balanced for his forage, body weight, and workload. But dirt-eating isn’t a reliable diagnosis of a salt or mineral deficiency; some horses seek out soil despite being managed on the same pasture and feed as herd mates that show no interest in it at all. See our guide to whether horses need salt and mineral blocks for how much your specific horse needs and how to provide it.

Gastric ulcers or other discomfort. Some owners and equine professionals have observed dirt-eating in horses that also have gastric ulcers, and one theory is that the behavior could somehow soothe stomach discomfort. But there isn’t good evidence showing that eating dirt treats or relieves ulcers.² A horse that suddenly begins eating dirt after a move, greater training demand, confinement, illness, or another stressful change deserves a closer look. Dirt-eating alone doesn’t diagnose ulcers, so discuss the full pattern of behavior, appetite, manure, body condition, and performance with your veterinarian.

Boredom and limited stimulation. Limited turnout, forage, or social contact can contribute to abnormal or repetitive behaviors in some horses. If a horse is spending long periods standing around with little forage to eat, increasing forage access and turnout is sensible regardless of whether boredom is actually driving the dirt-eating. For a deeper look at this connection, see our guide to practical horse-enrichment ideas.

Curiosity and normal exploration. Foals in particular investigate the world with their mouths, and some adult horses simply seem to like the taste or texture of certain soil. Not every instance of dirt-eating has an underlying problem behind it.

Pay attention to where he’s eating it. Is he repeatedly going to one particular patch of ground? Is he doing it only after finishing his hay, or scattered throughout the day? Is it happening in a bare paddock but not out on pasture? Is he licking soil occasionally, or deliberately taking mouthful after mouthful? Those details matter more than the fact that it’s happening at all. A horse licking one spot near a gate is a different situation than a horse working through bare, sandy ground every time he’s turned out.

Is Eating Dirt Dangerous for Horses?

An occasional mouthful of dirt isn’t usually a reason to panic. The primary concern with repeated dirt-eating is sand accumulation, particularly when the soil contains a lot of sand. Enough sand or fine soil in the digestive tract can cause irritation, interfere with normal gut function, and in some cases contribute to impaction or colic.

The amount and frequency matter more than the fact that it’s happening at all. A horse that occasionally licks or noses at dirt is very different from one consistently and deliberately eating mouthfuls of sandy soil.

What I Would Check If My Horse Started Eating Dirt

Check the salt and mineral program. A plain salt block or loose salt gives a horse consistent access without you having to guess. See our guide to whether horses need salt and mineral blocks for how to choose the right one.

Look at the overall diet. Make sure forage and feed are meeting your horse’s actual nutrient requirements, not just calories. Our guide to what a horse eats covers nutrient requirements by weight and workload if you want to check your current feeding program against it.

Look at forage availability and turnout. Free-choice or near-continuous forage, along with regular turnout and social contact, gives a horse’s mouth something more productive to do, whether or not boredom turns out to be the actual driver.

Introduce diet changes gradually. Sudden feed changes can upset a sensitive digestive system. Mix new feed in gradually over one to two weeks rather than switching all at once, and watch weight, appetite, and coat condition as you go.

Look at where he’s eating and off what. Feed hay and grain off the ground in a raised container or mat rather than directly on bare sandy soil, which cuts down on how much sand a horse incidentally ingests while eating normally.

When to Call the Vet

Call your vet if the behavior is new, escalating, frequent, or accompanied by other changes. Don’t wait to prove the diet is balanced before making that call. The same goes for any dirt-eating accompanied by weight loss, a dull coat, changes in manure, mild recurring colic signs, or a general drop in energy or appetite. Your vet can help decide whether the behavior warrants testing for a nutritional problem, gastrointestinal disease, parasites, sand accumulation, or something else, based on your horse’s specific history and symptoms.

Geophagia in Horses FAQs

Sources:
1. McGreevy, P.D. et al., “Geophagia in horses: a short note on 13 cases,” Applied Animal Behaviour Science.
2. Kentucky Equine Research, “Geophagia: Eating Dirt Could Have Several Explanations”.

My granddaughter’s question turned out to have a more complicated answer than either of us expected. Most horses that eat a little dirt now and then are fine, and the behavior itself isn’t something to panic over. What’s worth paying attention to is a change: a horse that suddenly starts, does it a lot, or shows other symptoms alongside it. That’s when I’d look closer, not just at the dirt, but at the diet, the routine, the footing, and the horse himself.