Dion was a consistent producer from the blueline for the Terriers for parts of five seasons. During his first two years with the team, Dion led the defense in scoring but BU didn't have much success team-wise. He played on Team USA at the 1989 World Junior Championships along with future NHL stars like Jeremy Roenick and Mike Modano. Despite the talent on the team, the US finished 5th with a .500 record.