Which of the following is NOT an indicator of a horse's hydration status?

The correct answer is the dehydration percentage, as it is a measure rather than an indicator of hydration status that can be assessed through physical examination. Indicators of a horse’s hydration status usually involve observable physical changes in the horse's body condition or physiological signs.

Skin elasticity, for example, provides a direct, observable indicator. When you pinch the skin on a horse’s neck and it returns to its normal position quickly, the horse is likely well-hydrated. If it takes longer to return, that could indicate dehydration.

Pulse rate can be useful in assessing hydration, as dehydration can affect heart function and increase heart rate. Body temperature also plays a role, as dehydration can lead to changes in how the body regulates temperature.

While dehydration percentage is important in terms of quantifying how much fluid a horse has lost, it is primarily derived from other indicators rather than being an outwardly visible sign. Understanding these distinctions helps in effectively assessing a horse’s hydration to ensure their health and well-being.