If your horse is repeatedly licking or eating soil, it’s worth taking a closer look. Rather than just a curious quirk, ‘geophagy’, the specific form of ‘pica’ involving soil or earth ingestion, is often a direct signal about your horse’s diet, environment, or mental well-being.
To further explain, Pica refers to an umbrella medical term for the intentional ingestion of non-nutritive, non-food substances (such as wood, bedding, rocks, plastic, or manure). While geophagy is specific subtype of pica defined as the deliberate consumption of soil, earth, or clay.
Horses are biologically designed to spend up to around 18 hours a day grazing, foraging, and chewing. When these natural behaviours are restricted, or when physical needs go unmet, horses often adapt by developing abnormal oral habits.
Why Do Horses Eat Dirt?
There is rarely a single cause for geophagy. While it is frequently linked to nutrient seeking behaviour, the underlying motivation can be physical, environmental, or psychological:
- Mineral Imbalances: Soil consumption is commonly associated with a lack of essential minerals, including sodium, copper, zinc, cobalt, and phosphorus. Certain patches of ground hold higher mineral concentrations, drawing horses back repeatedly. However, eating dirt does not automatically confirm a deficiency.
- Boredom and Stress: Restricted turnout, social isolation, or prolonged stabling can lead to frustration, which horses soothe through repetitive oral behaviours.
- Lack of Foraging: When total forage intake or chewing time is limited, the natural instinct to forage remains active, driving the horse to sift through soil.
Licking vs. Eating: What's the Difference?
Horses naturally explore their surroundings using their sensitive lips and tongues, making occasional ground licking normal exploratory behaviour. Concern is only warranted when exploration turns into habitual, deliberate consumption.
Key Warning Signs:
- Repeatedly licking, biting, or digging into soil
- Returning frequently to the exact same patch of ground
- Dirt or sand visible in manure
- Changes in normal forage intake or overall appetite
- Increased interest in chewing wood, bedding, or manure
- Broader behavioural shifts, such as agitation or lethargy
The Hidden Digestive Risks
Ingesting dirt carries real health risks that scale with the volume consumed:
- Sand Colic & Impactions: Sediment accumulates in the large colon, causing severe inflammation, abdominal pain, or blockages.
- Parasite Exposure: High traffic dirt patches and bare paddocks often carry concentrated parasite loads.
- Impaired Absorption: Heavy sediment can irritate the intestinal lining, impairing nutrient absorption and worsening underlying dietary gaps.
Risk factors spike when horses graze sparse pastures, eat hay directly off bare ground, given hay/haylage on arena sand surfaces, or systematically dig up turnout areas.
Five Foundations to Check First
Before adding new supplements to the feed bucket, step back and evaluate these core management factors:
|
Foundation Area |
Key Action Steps |
|
1. Forage Profile |
Forage must form the bulk of the diet. Consider a full laboratory forage analysis to identify actual mineral levels rather than guessing. |
|
2. Mineral Balance |
Ensure daily rations provide balanced micro and macro minerals. Indiscriminate supplementation can cause toxicities or block other essential nutrients. |
|
3. Sodium Intake |
Forage is naturally low in sodium. Because free choice salt licks yield unpredictable intake, adding measured plain salt to daily feed offers a reliable solution. |
|
4. Chewing Time |
Extend eating time using slow-feeders, multiple feeding stations, or lower calorie, high-fibre forage to satisfy the biological urge to chew. |
|
5. Environment |
Maximize turnout, movement, social interaction, and paddock enrichment. Increasing mental stimulation often eliminates stress induced oral habits. |
Reading the Behaviour
A horse licking the ground isn't automatically asking for a mineral block. It might be communicating something much simpler:
"I'm bored."
"I'm hungry."
"I need more fibre to chew."
"Something in my management needs adjusting."
Occasional soil licking requires simple observation. However, if dirt consumption is persistent, excessive, or accompanied by changes in weight or manure, consult a veterinarian or qualified equine nutritionist to review the entire picture.