Key takeaways
Lethargy describes lack of energy and enthusiasm that persists regardless of exercise and activity. Lethargic horses may seem sleepy or drowsy, hang their heads low, or show lack of interest in food, other horses, or their environment.
- Lethargy is associated with a wide variety of conditions, ranging from changes in diet to cardiovascular disease or endocrine disorders
- Other accompanying symptoms are often more helpful in determining both the severity of the underlying disease and risk
- Lethargic horses benefit from veterinary examination
- Horses with severe lethargy require emergency veterinary care
- Diagnostics include a physical examination, bloodwork, diagnostic imaging, endoscopy, and neurologic examination
- Treatment is determined by the underlying cause
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A closer look: Lethargy in Horses
Lethargy ranges from mild tiredness to more severe apathy. Horses showing severe lethargy require immediate veterinary attention, as severe lethargy is associated with potentially life-threatening conditions.
If presenting acutely, severely, or alongside other serious symptoms, emergency veterinary care is required.
Possible causes
All types of disease have the potential to cause lethargy.
Risk factors
Lethargy is a common symptom in horses, and can be caused by a wide variety of medical conditions, with varying degrees of severity. Any affected horse requires prompt veterinary intervention to begin treatment.
Lethargy can develop slowly (chronically) or quickly (acutely), with sudden changes requiring more prompt intervention.
Lethargy can present constantly or intermittently. Noting the times and contexts surrounding inconsistent lethargy may help a vet diagnose the underlying condition. Consistent lethargy is typically associated with more severe conditions.
Testing and diagnosis
Diagnostics include;
- A physical examination
- Bloodwork
- Urinalysis
- Diagnostic imaging
- Lameness examination
- Endoscopy
- Neurologic examination
Further diagnostics may be indicated, based on other symptoms present or the findings of initial diagnostic tests.
Treatment depends on the underlying cause.
Similar symptoms
Although similar, lethargy is not limited to periods of physical activity.
