For a 500 kg horse, the approximate IV shock dose is about how many liters?

• A. 20-25 L
• B. 40-45 L
• C. 60-70 L
• D. 80-90 L

Answer: (B)

In treating a horse in shock, the IV shock dose represents the rapid bolus amount of isotonic fluid used to restore circulating volume and tissue perfusion. For a 500 kg horse, this initial resuscitation is about 40 to 45 liters, which works out to roughly 80 to 90 milliliters per kilogram. This volume is chosen to quickly improve signs of perfusion—such as heart rate, mucous membrane color, capillary refill, and urine output—while you monitor for signs of fluid overload and reassess after giving the bolus. If the horse still shows poor perfusion after this initial amount, fluids are continued or titrated carefully based on response. Smaller volumes would likely be insufficient to restore perfusion promptly, while much larger amounts raise the risk of overload.