Which of the following behaviors might indicate a horse is in pain?

The behavior that indicates a horse might be in pain is evidenced by sudden changes in behavior or an unwillingness to work. When a horse is typically willing and capable of performing certain tasks but suddenly becomes resistant or shows unexpected changes in its demeanor, it can be a clear signal of discomfort or distress. Horses, in general, are very stoic animals, meaning they often hide their pain until it becomes severe. Thus, a marked shift in their normal patterns, such as reluctance to work or unusual irritability, can signify underlying issues such as injury, illness, or pain.

The other behaviors listed may not necessarily indicate pain. Increased social interactions can be a sign of good health and social well-being among horses. Grooming and scratching against objects can indicate normal behavior for horse care and comfort-seeking rather than pain. Similarly, resting frequently while in the field is a natural behavior for horses, especially if they have been active before. Therefore, it is important to monitor changes in a horse's routine or behavior closely, as these are often the first signs of potential pain or health problems.