Anhidrosis — or the inability to sweat — is a uniquely equine condition. Affected horses are at risk of overheating, which can lead to serious consequences.
Anhidrosis is most common in the southeast United States where summer heat and humidity can be oppressive. The first signs are often heavy breathing or panting, which may be mistaken for a respiratory infection or equine asthma. In reality, the horse is simply trying to cool down. A skin test administered by a veterinarian can confirm the diagnosis.
Affected horses need to refrain from athletics during the summer. Other management strategies include shading, using fans and misters, rinsing with cold water and turning the horse out at night instead of during the day.
Finally, because anhidrosis has a genetic component, owners need to think long and hard about breeding these horses.