Which of the following is a sign of distress in a racehorse?

Excessive sweating and changes in behavior are significant signs of distress in a racehorse. When a horse is experiencing distress, it may exhibit physical symptoms such as sweating more than usual, which indicates that it could be under stress or experiencing pain. Changes in behavior, such as increased agitation, restlessness, or withdrawal from normal activities, can further signal that a horse is not feeling well or is in a stressful situation. Both physical and behavioral indicators are critical for trainers and caretakers to monitor, as they can help in early identification of potential health issues or discomfort, enabling appropriate interventions to be made for the well-being of the horse.

In contrast, brisk walking, a calm demeanor, or an increased appetite do not generally point to distress; instead, they can be associated with a healthy and comfortable horse. Brisk walking can indicate energy and readiness, a calm demeanor suggests that the horse is at ease, and an increased appetite typically signifies good health.