The current incarnation of Jack, who will be taking over from his predecessor during the spring 2024 semester, is an English Bulldog born in 2023 whose full name is Serchell's John P. Carroll.

[11] After Stubby died in 1926, the team then chose a female bull terrier named Jazz Bo, who had been brought to campus by Georgetown College student Paul Van Laanen.

[7] In 1962, with the resumption of football, students Stan Samorajczyk and John Feldmann, editors of The Hoya campus newspaper, founded a committee to raise money for the purchase of a new mascot dog in time for the first new games in 1964.

[7][22] In 1998, Michael Boyle, Austin Martin, and Kathleen Long, co-founders of the Hoya Blue fan club began a campaign to revive the tradition of an official live mascot with the assistance of English professor Father Scott R. Pilarz, S.J.

[15] The "Bring Back Jack" Campaign initially sought to find a suitable dog among the students and faculty, as the university did not want to use school funds for the purchase.

[23] Ultimately, Hoya Blue raised $1,500 to purchase a new puppy named Jack (officially, John P. Carroll) and placed him in the care of Father Pilarz on February 16, 1999.

[24] John P. Carroll died on September 16, 2011, at the home of Pilarz's parents in Voorhees Township, New Jersey, at the age of 12.

His official name, as registered with the American Kennel Club was Brookhollow's John S. Carroll, which allows for the nickname Jack.

[16] Crew members were required to be able to show their school spirit and their ability to control Jack, including being aware of his affinity for orange traffic cones.

[30] Jack had both an email address, a Facebook profile, a student ID card, and a local phone number, and the campus directory listed him as part of the theology faculty, like Father Steck.

[31] Jack attended home basketball games at the Verizon Center, where he entertained fans by attacking a cardboard box decorated with opponents' logos.

[38][39] In March 2013, school announced that Jack would "retire" from gameday duties after the end of the 2012–13 basketball season, and officially take a smaller role.

[40][41] On March 30, 2012, Georgetown announced the donation of a new bulldog puppy from San Diego breeders Janice and Marcus Hochstetler, whose children Nathan and Rachel attend the school.

[52] In an editorial in The Hoya, Steck also lamented the school's choice not to involve the Bulldog Advisory Committee, which began meeting earlier in the summer, in its decision.

[55] On August 30, 2013, Pugh announced the arrival of a new puppy, also from the Hochstetler family and an offspring of Treasure, J.J.'s mother, though they come from different litters.

"[27] In early October 2013, the school announced that Steck would not be the new mascot's caretaker, but that another, not necessarily a Jesuit, would be selected from the Georgetown community.

[59] Responding to criticism, the school involved the fourteen-member Bulldog Advisory Committee in the replacement process and selection of the caretaker.

[61] Starting in December 2014, Jack began performing at home basketball games by riding a skateboard across the court.

[63] On July 24, 2019, the school acquired a new bulldog puppy from the Hochstetler family to work alongside the current Jack before taking on the role in the 2019–20 academic year.