 Waldrug is a lifeline for locals, whether they need routine medication or treatment for something more unusual. Dinger once gave antibiotics to a park ranger who was bitten by a prairie dog. You never know what kind of diseases they might be carrying. Without Waldrug, prairie dog bite victims would be in trouble. The National Park Service is warning the public that some of the animals carry the plague. I'm Arielle Zients in Wall, South Dakota.