Horses in stressful situations such as trailering, showing or racing are predisposed to the development of anhydrosis, especially if the environment is warm. The clinical presentation of anhydrosis includes the failure to sweat in response to heat or exercise, exceeding 42ºC, anorexia, tachycardia, tachypnea at rest, heat intolerance, exercise intolerance, alopecia, dermatitis and loss of condition. Diagnosis is made through clinical signs and symptoms and the intradermal injection of epinephrine to evaluate the sweat response. Treatment is primarily symptomatic and should include cool hydrotherapy, rest and avoidance of stressful or hot situations. If an underlying autoimmune disease is suspected corticosteroids are administered .
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