The most common form of anhidrosis is incomplete or partial anhidrosis. Horses that experience incomplete anhidrosis may not perform as well or may be a bit lethargic. This decline in performance will correlate with a rise in temperature during the summer. The horse also will not sweat as much as normal. Some of the signs for this type of anhidrosis include “an elevated respiratory rate and an elevated rectal temperature that requires an extended period of time (more than 30 minutes) to return to the normal range after exercise ceases” (Hagyard).