How Do I Know If My Horse Is Sick?
One of the most important skills you can develop as a horse owner is learning what normal looks like for your individual horse.
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By Michel Scavuzzo, Founder, PetCompanionAI
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Quick answer
Learn to recognize that difference.
This is educational context, not a diagnosis. Read the full explanation and sources below.
Horses cannot tell you that their stomach hurts, they feel weak, or something suddenly feels different.
But they can show you.
Sometimes illness produces obvious symptoms. Other times, the first warning is surprisingly subtle: your horse doesn’t finish breakfast, isn’t waiting at the gate, stands away from the herd, or simply seems different.
Knowing your horse’s normal behavior makes those changes much easier to recognize.
Common Signs That a Horse May Be Sick
No single symptom proves that a horse is ill, but changes worth paying attention to include:
- Loss of appetite or eating less than usual
- Drinking significantly more or less than normal
- Reduced or abnormal manure production
- Diarrhea
- Unusual sweating
- Coughing
- Nasal or eye discharge
- Fever
- Increased breathing or heart rate
- Lethargy or weakness
- Standing away from other horses
- Spending unusual amounts of time lying down
- Repeatedly looking at the abdomen
- Pawing or rolling
- Weight loss
- Swelling
- Lameness or unusual movement
- Changes in urination
- Difficulty chewing or dropping feed
- Sudden behavioral or personality changes
The important word is change.
Something that is normal for one horse may be unusual for another.
Start With Appetite
Appetite is one of the easiest things to observe every day.
Many horses are enthusiastic about meals. When a horse that normally comes running for food suddenly doesn’t want to eat, pay attention.
Loss of appetite can accompany many different problems, including dental pain, gastrointestinal problems, fever, infection, or other illness.
Don’t automatically assume your horse is simply being picky when their normal eating behavior suddenly changes.
Pay Attention to Water
Know approximately how much your horse normally drinks and check that clean, fresh water is available.
Water consumption can vary with temperature, workload, diet, pregnancy or lactation, and other factors.
A noticeable change in drinking behavior can still provide useful information.
If your horse suddenly drinks dramatically more or less than usual, look for other changes and discuss significant or persistent abnormalities with your veterinarian.
Look at the Manure
It may not be glamorous, but manure tells you a lot about a horse.
Learn what your horse normally produces.
Pay attention to:
- Amount
- Frequency
- Consistency
- Unusual dryness
- Diarrhea
- Significant changes in appearance
Reduced manure production combined with loss of appetite, abdominal discomfort, pawing, rolling, or repeatedly looking at the flank can be particularly concerning for gastrointestinal problems such as colic.
Learn Your Horse’s Normal Vital Signs
Don’t wait until an emergency to learn how to check basic vital signs.
For a resting adult horse, commonly referenced normal ranges are approximately:
Temperature: 99–101.5°F Heart rate: 28–44 beats per minute Respiratory rate: 8–16 breaths per minute
Normal values can vary somewhat between horses and circumstances, so establishing your individual horse’s healthy baseline is extremely useful.
Exercise, excitement, weather, pain, and other factors can temporarily change these measurements.
If you’re unsure how to safely obtain vital signs, ask your veterinarian to show you.
Check the Gums
A healthy horse’s gums are generally moist and pink.
Changes in gum color or moisture can sometimes provide important information about circulation and hydration.
Very pale, dark red, bluish, purple, yellow, unusually dry, or otherwise abnormal-looking gums deserve attention, particularly when accompanied by other signs of illness.
Your veterinarian can teach you how to evaluate your horse’s gums and capillary refill time correctly.
Watch How Your Horse Stands
Body language can reveal discomfort.
A horse experiencing abdominal pain may repeatedly look toward the flank, paw, stretch, lie down, or roll.
A horse with painful feet may shift weight frequently or stand differently.
A horse experiencing generalized illness may stand quietly with the head lowered and show little interest in its surroundings.
Learn your horse’s ordinary posture so unusual positions become obvious.
Watch Your Horse Move
Movement is another valuable clue.
Look for:
- Limping
- Shortened steps
- Stiffness
- Reluctance to turn
- Reluctance to move
- Stumbling
- Poor coordination
- Unusual weakness
- Changes in balance
A sudden significant change in movement deserves attention.
Don’t automatically assume a horse refusing to perform a familiar activity is being stubborn.
Sometimes behavior is the first visible expression of pain.
Look at the Eyes and Nose
Eyes should generally appear bright and comfortable.
Squinting, excessive tearing, swelling, cloudiness, obvious injury, or significant discharge can indicate a problem.
Eye problems in horses can become serious quickly, so a painful or abnormal-looking eye deserves prompt veterinary attention.
Also notice nasal discharge.
A small amount of clear discharge isn’t necessarily illness, but persistent, thick, bloody, foul-smelling, or unusual discharge—particularly when accompanied by coughing, fever, or breathing changes—should be investigated.
Know What Is Normal for Your Horse’s Breathing
A resting horse should generally breathe quietly and comfortably.
After exercise, breathing naturally increases and should gradually recover.
Difficulty breathing at rest, pronounced abdominal effort, flared nostrils without an obvious reason, persistent coughing, or other respiratory distress should be taken seriously.
Check Your Horse Every Day
A useful daily health check doesn’t need to take an hour.
When you see your horse, ask yourself:
Are they eating?
Are they drinking?
Are they producing normal manure?
Are they walking normally?
Are they interacting normally?
Are their eyes bright?
Are they breathing comfortably?
Do you see swelling, wounds, or discharge?
Do they simply seem like themselves?
Those observations can become your horse’s early-warning system.
When Should You Call the Veterinarian?
Contact your veterinarian when you’re concerned about a significant or unexplained change in your horse’s health.
Certain signs warrant particularly prompt attention, including severe or persistent colic symptoms, difficulty breathing, serious injury or bleeding, inability to stand, significant neurological abnormalities, severe lameness, suspected laminitis, a painful or injured eye, choking, or other rapidly worsening symptoms.
If you’re uncertain whether a situation is urgent, calling your veterinarian and describing what you’re seeing can help determine the appropriate next step.
Keep Records
You don’t have to rely entirely on memory.
Keep basic information about your horse’s:
- Normal vital signs
- Weight or body condition
- Vaccinations
- Medications
- Dental care
- Farrier visits
- Previous illnesses and injuries
- Changes in appetite or behavior
Photos and videos can also help document changes in body condition, movement, swelling, wounds, or behavior over time.
Records can help owners organize and monitor information about the animals in their care, but they should support—not replace—careful observation and appropriate veterinary evaluation.
Nobody Knows Your Horse Like You Do
Veterinary knowledge matters enormously.
But your veterinarian isn’t standing beside your horse every morning.
You are.
You know how quickly your horse normally finishes breakfast. You know where they stand in the pasture. You know how they walk toward you. You know their personality.
That everyday familiarity is valuable.
Don’t wait until something looks catastrophic before paying attention.
Sometimes the earliest sign of illness isn’t dramatic at all.
Sometimes it’s simply the feeling that:
“My horse isn’t acting like my horse.”
Learn to recognize that difference.
Your horse can’t explain how they feel—but their behavior can tell you when it’s time to look closer.