Handsome Dan is a bulldog who serves as the mascot of Yale University's athletic teams. In addition to a person wearing a costume, the position is filled by an actual bulldog, the honor (and the title "Handsome Dan") being transferred to another upon death or retirement. Handsome Dan is selected based on his ability to tolerate bands and children, negative reaction to the color crimson and to tigers (the symbols of rival schools Harvard and Princeton respectively), and cleanliness.