After the 1917 racing season, Regret was retired for breeding to the new Whitney farm in
Lexington, Kentucky. In this last season, she raced in the
Brooklyn Handicap against the best of her generation:
Old Rosebud,
Roamer,
Omar Khayyam (winner of the 1917 Kentucky Derby), Boots, Ormsdale and Chiclet. In the final strides, she was defeated by a nose by her stablemate, Borrow, giving away 5 pounds. Out of 11 starts in four seasons (1914–1917), Regret won nine, and placed second in one. The only race she was not placed in was the 1916 Saratoga Handicap. Throughout her career, she was never beaten by a female horse. As a broodmare, she produced only one major stakes winner, Revenge, out of eleven foals. She died in 1934, aged 22, and was buried at the Whitney farm in Lexington. ==Assessment and honors==