In Part 1 of this series, we saw how complex and sensitive a horse's gut really is. Today we'll get practical: What do you see, feel, and notice in your horse when its gut is out of balance?
Many of these signs are subtle. They creep up gradually. And because we see our horses every day, we sometimes get used to what is actually a signal. This article aims to help you look more closely.
The 12 warning signs are divided into three categories: direct digestive signs, physical changes, and behavioral changes. Because the gut doesn't just communicate through feces – it communicates through the whole body.
Important note in advance
• No single warning sign is proof of intestinal problems. Symptoms can have many causes.
• Several of these signs simultaneously or over a longer period are a clear signal to consult a veterinarian.
• Let me say it again, what is already clear: This article does not replace a veterinary diagnosis – it sharpens your perception.
Category 1: Direct Digestive Signs
The most obvious first. These signals come directly from the digestive tract and are the easiest to observe.
1. Fecal water syndrome
Brownish fluid runs from the anus – separately from the formed feces. The horse has no control over it. The hind legs and tail root are permanently soiled and irritated. Fecal water syndrome is the best-known sign that something is wrong in the large intestine: the balance between water absorption and release is disturbed, often triggered by a microbiome dysbiosis.
→ Zeolite supports the stabilization of the microbiome and can improve fecal consistency. Learn more in the article: Naturally treating fecal water syndrome in horses.
2. Changed fecal odor or unusual fecal color
Horse manure always smells somewhat sour-fermented, but a pungent, putrid, or strongly acidic smell is not normal. Very dark, almost black feces or very light, yellowish feces can also indicate changes in the microbiome or bile production. Occasionally yellowish feces after a lot of fresh grass is normal, however.
3. Very dry, hard feces or frequent small amounts of feces
Too dry feces – droppings that hardly break apart and dust when they hit the ground – indicate insufficient water supply in the large intestine. The opposite, very small, poorly formed feces at a high frequency, can indicate increased intestinal activity or irritation. Both are worth observing.
4. Frequent yawning, teeth-grinding, or chewing without food
These gestures are often misunderstood as bad habits. However, they can be a sign of stomach discomfort: The horse tries to produce more saliva through chewing movements to buffer stomach acid. Especially if the behavior occurs shortly after eating or after a long period of fasting, it should be taken seriously.
5. Recurrent colic susceptibility
A horse that shows colic two or three times a year is not "unlucky". Recurrent colic is almost always a sign of a structural problem: poor hay quality, insufficient water intake, incorrect feeding intervals, or a persistently disturbed microbiome. Colic itself is the loud symptom – the actual cause lies deeper.
→ Zeolite can be used as part of prevention: binding of fermentation gases and toxins relieves the large intestine.
Category 2: Physical Changes
The gut is not an isolated system. What happens in the large intestine shows up on the skin, coat, hooves, and general body condition. These connections are often underestimated.
6. Dull, shaggy, or slow-changing coat
A healthy, shiny coat change is a sign of efficient nutrient absorption in the gut. If the microbiome is disturbed, fatty acids, vitamins, and trace elements are absorbed less effectively – the coat becomes dull, dry, or the coat change is prolonged. If the horse does not develop a shine despite good feeding, it is worth investigating the gut as a possible cause.
7. Weight loss despite sufficient food intake
If a horse eats but does not gain weight or even loses weight, the problem is not in the food – but in its absorption. A damaged or disturbed gut microbiome can significantly reduce the efficiency of fermentation. The energy contained in the food is not fully utilized. Chronic inflammation of the intestinal lining can also impair nutrient absorption.
→ Zeolite can soothe the intestinal lining and stabilize the environment for healthy fermentation.
8. Abdominal pain posture or tense abdomen
A horse that constantly pulls its abdomen away when touched, frequently looks at its belly, or reacts unwillingly when girthed is communicating discomfort. This can indicate stomach ulcers, an irritated intestinal lining, or accumulated fermentation gases in the large intestine. These signs are often categorized as "character" or a back problem – but the search often begins in the wrong area.
9. Poor hoof quality or delayed hoof growth
Hooves need biotin, zinc, sulfur, and other micronutrients – all dependent on functional intestinal absorption. Brittle hooves, cracks, slow growth, or problems that don't go away despite hoof care can be a sign that the gut is not absorbing enough nutrients. Laminitis, which is closely related to insulin resistance and gut dysbiosis, is the extreme end of this spectrum.
Category 3: Behavioral Changes
In Part 1 we described the gut-brain axis: The gut and nervous system are in constant communication. What happens in the gut influences how the horse feels – and behaves. This category is most often overlooked in the stable because the connection to the gut is not obvious.
10. Unexplained restlessness, nervousness, or increased spookiness
A horse that suddenly or gradually becomes more restless, overreacts, paws in the stable, or has difficulty settling down – and for which there is no external cause – may be showing a gut problem. The microbiome produces neurotransmitters that regulate mood. Dysbiosis can put the nervous system in a permanent state of alarm. Stress hormones, in turn, further damage the microbiome. A vicious cycle.
→ Zeolite binds metabolic waste products and toxins that can fuel this cycle.
11. Decreased willingness to perform or faster fatigue
If a horse that is usually willing and enduring begins to refuse work, tires more quickly, or is difficult to motivate, one first thinks of muscles, joints, or back. But a persistently poor body feeling due to intestinal discomfort can also reduce the willingness to perform. Energy that the body needs for inflammatory processes in the gut is not available for work.
12. Changed eating behavior: slow eating, dropping food, loss of appetite
A horse that eats more slowly than usual, drops food from its mouth (quidding – often a dental problem, but not always), suddenly rejects certain foods, or generally shows less interest in eating may be protecting itself. Eating means: acid production, intestinal movement, fermentation. If this is painful or uncomfortable, loss of appetite is a logical reaction of the body.
What to do if you recognize several of these signs?
First, don't panic. Many of these signals develop slowly and have time before they become real problems.
A sensible first step is an observation protocol: Note which signs you notice when, how often, in what situation. This helps you – and your veterinarian or alternative practitioner – enormously.
5 immediate measures that always benefit the gut
• Roughage: Ensure the horse is never without hay for more than 4 hours
• Water: Ensure fresh, tempered water is always accessible
• Exercise: Daily exercise significantly promotes intestinal peristalsis
• Feeding routine: No abrupt feed changes – introduce every change gradually over at least 10 days
• Reduce stress: Social contact, pasture access, and routine stabilize the nervous system and thus the gut
If you want to additionally support the gut, you can consider zeolite as a feed additive. How to do this correctly is explained in the article Feeding zeolite to horses – dosage, application & practical tips on this blog.
What you take away from this article
• Gut problems don't just show up in feces – they show up in the whole horse
• Behavioral changes, coat quality, and hoof growth are often underestimated gut signals
• Several signs simultaneously or over time are a clear indication to look more closely
• Simple measures like consistent roughage and exercise help the gut immediately
• In Part 3, we look at a frequently overlooked cause: mycotoxins in hay
Frequently asked questions
★ Can my horse have gut problems without visible fecal water?
Yes – and this is more common than you think. Fecal water is the best-known sign, but behavioral changes, coat problems, or decreased performance can also indicate gut dysbiosis long before fecal water appears.
★ My horse has had a dull coat for weeks, but eats normally. Should I be concerned?
A dull coat despite good feeding is a signal that should not be ignored. Possible causes range from mineral deficiencies to poor intestinal absorption to thyroid problems. A blood count and a veterinary assessment are useful.
★ How quickly does the gut react to changes in feeding?
The microbiome can shift significantly within 24 to 48 hours with abrupt feed changes. Therefore: introduce every feed change slowly over 10 to 14 days – including the change from hay to pasture in spring.
★ Can zeolite address all 12 warning signs simultaneously?
Zeolite is not a panacea. It supports the gut as a system – by binding toxins, stabilizing the environment, and soothing the mucous membrane. Many of the 12 warning signs have their root in a disturbed intestinal balance, and zeolite can be a useful building block in this regard. However, it does not replace feeding management or veterinary treatment.
★ When should I definitely see a veterinarian?
Immediately for: acute colic signs (sweating, rolling, not eating), more than 2 hours without defecation, significant weight loss within a few weeks, or strong behavioral changes without an identifiable trigger.
More from the series: Gut & Detoxification in Horses
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All parts of the series: • Part 1: The horse's gut – how it really works • Part 2: Signs that your horse has gut problems – 12 warning signs ← you are here • Part 3: Mycotoxins in the horse's gut – the silent risk in hay • Part 4: Zeolite and the horse's gut – what animal research and practice confirm together ← coming soon • Part 5: Gut cure for horses – step-by-step program with zeolite ← coming soon |
Continue in the series →
Part 3: Mycotoxins in the horse's gut – the silent risk in hay
⭕️ Read more:
→ Zeolite - everything you need to know about feeding horses: Q&A and guide
→ Buy zeolite products for gut problems
