Prairie Dog in Front of Prairie Dog Trap with Sylvatic Plague Vaccine Bait. (image) Morris Animal Foundation Share Print E-Mail Caption Prairie dogs are an important food source for endangered black-footed ferrets. Protecting prairie dogs from plague helps keep ferret populations healthy. Credit Dr. Gebbiena Bron, University of Wisconsin Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.