A fungal pathogen spread around the globe by human activities now threatens many amphibians, including boreal toads, a high elevation specialist in the Rocky Mountains. In the lab, we increased toad survival by 40% when we applied a native fungus-fighting bacteria as a probiotic treatment. We are moving this probiotic method from the lab out into the field to assist wild boreal toad populations currently undergoing an epidemic infection caused by the fungus.