What is a common indicator of a horse's health?

A common indicator of a horse's health is the coat condition and overall demeanor. A healthy horse typically has a shiny, smooth coat that is free from excessive dirt, dandruff, or bald patches, signifying proper nutrition and health. Additionally, the horse's demeanor—its behavior and attitude—can also provide important clues about its well-being. A horse that is energetic, alert, and interactive typically indicates a good state of health, whereas lethargy or aggression might point to underlying health issues.

While the other options may influence a horse’s overall well-being, they do not directly indicate health status. The number of rides per week relates more to the horse’s workload and fitness level rather than its health. The length of the horse's tail does not impact or directly reflect its health; it simply varies by breed and individual care. Lastly, the type of feed given is important for proper nutrition but does not serve as an immediate and clear indicator of health unless directly observed in conjunction with other factors like coat condition and demeanor.