Mo Donegal is out of Callingmissbrown (Pulpit), who won two of her four starts, and is her second foal and second winner. He is a half-brother to the dual winner Bluegrass Belle (Speightstown).

Second dam Island Sand (Tabasco Cat) won the Grade 1 Acorn S. and was second in the Grade 1 Kentucky Oaks. She has produced five other winners, among them Martini Brother (A.P. Indy), a Listed winner over hurdles who was Grade 1-placed over fences, the dual winner Maya Malibu (Malibu Moon), twice Grade 1-placed, and the nine-time winner Midnite Poppa (Unbridled's Song), who was stakes-placed.

The third dam Sue's Last Dance (Forty Niner) was unraced and produced seven other winners, with Island Sand the only one at stakes level.

Sue's Last Dance is a half-sister to Niigon (Unbridled), winner of the Listed Queen's Plate.

Callingmissbrown has the unraced 2-year-old filly Prank (Into Mischief) and a colt foal by Curlin.