What does capillary refill time in horses help assess?

Capillary refill time (CRT) in horses is a valuable assessment tool primarily used to evaluate hydration status. It involves observing how long it takes for color to return to the mucous membranes (usually the gums) after they are pressed and briefly turned white. In a hydrated horse, the color should return quickly, typically within 2 seconds. A prolonged capillary refill time can indicate dehydration, poor circulation, or other underlying health issues.

Assessing hydration status is vital in maintaining the overall health of the horse, particularly in determining the need for fluid therapy or assessing the impacts of exercise, heat, or illness. Therefore, understanding CRT provides critical insight into the horse's welfare and helps guide appropriate management or veterinary intervention.