Although athletics at Union College in 1905, the teams did not have an official nickname until 1925. That year, by a vote of the student body, the Bulldog was selected as the schools nickname.
However, Union did not have a live mascot until the 1960s when through the efforts of some students a bulldog was purchased. Mack, a boy, was a mainstay at Union sporting events during his lifetime, even traveling with the 1967-68 men's basketball team to Kansas City, Mo., for the NAIA National Championship Tournament. Unfortunately, Mack passed away in 1972, and it was not until 1999 that Union had another live mascot.
The latest mascot is named Millennium Mack but is called Mille Mack for short. A girl, she received that name in recognition of the new millennium that was about to begin as well as honoring Union's past mascot, Mack. However, due to illnesses, Millie Mack has not been able to regularly attend Union athletic events.