Calf scours or diarrhea is one of the leading causes of early calf mortality. This podcast is based on a presentation given by Dr. Jess Goff at the 2020 NE Ohio Regional Dairy Conference in Wooster. The podcast begins with a discussion of normal small intestine function. The next point is causes of calf diarrhea and the resulting disruption of normal small intestine function. The podcast concludes with a discussion of how to evaluate the severity of calf diarrhea and use of rehydration fluid as a treatment option.