This document provides guidelines for assessing and treating severe dehydration in pediatric patients. It outlines signs of severe dehydration including diarrhea and two of lethargy, sunken eyes, or slow skin pinch. Treatment involves rapid intravenous fluid resuscitation for dehydrated patients without severe malnutrition or shock. For those with severe malnutrition or shock, oral or nasogastric rehydration is preferred over intravenous fluids to avoid complications. The guidelines provide detailed treatment plans involving fluid amounts and types based on the patient's age, weight, and presence of other conditions like malnutrition or shock.