Walk past the George Sherman Union often enough and you’re likely to catch a glimpse of a Boston terrier sitting and smiling, showing its pink, wet tongue while being pet by a crowd of Boston University students.

Whether he is climbing into the stands at a Boston University hockey game or parading around the George Sherman Union, Rhett the Terrier is an unmistakable figure on Commonwealth Avenue. Chances are, you have exchanged a hug or a high-five with him at some point.

With Boston University’s Mascot Program kicking off its first day of auditions this past Friday, BU’s Department of Athletics is looking for interested students to take on the role of Rhett the...