[1][2] The title of Best in Show at Westminster has been awarded every year beginning in 1907 except for 1923 when changes in American Kennel Club rules prohibited mixed breed judging until a uniform process could be adopted;[3] following further changes in rules it was awarded again in 1924.

[10] A dog can only become a champion by gaining championship points at other conformation shows.

[11] Prior to 1992, admission to dogs was open, and in 1938 an English Setter named Daro of Maridor won the Best in Show title at Westminster in his first outing at a dog show at the age of 11 months.

[12] In 1929, a previously unregistered British dog won at Westminster using the name Laund Loyalty of Bellhaven, aged nine months in his only show on American soil.

[14] As of 2020, the most successful dog to win Best in Show at Westminster was a Smooth Fox Terrier named Ch.