(CNN) -- Here's a look at the Westminster Kennel Club Dog Show, the second oldest continuous sporting event in the United States, after the Kentucky Derby.
The 139th Annual Westminster Kennel Club Dog Show takes place February 16-17, 2015. The Hon. David Merriam has been selected to judge Best in Show.
Facts: Only 3,200 dogs can compete in the show.
The show is "benched," meaning the dogs must be on public display to ticket holders throughout the competition.
Dogs are invited to compete based on strict entry requirements, including how many other dogs they've defeated in breed competitions. Non-invited dogs can also compete if they have won a certain number of major dog show awards.
Breeds are categorized into groups: Sporting, Hound, Working, Terrier, Toy, Non-Sporting, and Herding.
The dogs compete for Best in Breed, then move up to Best in Group, then compete for the grand prize of Best in Show.
Terriers have won the most Best in Show awards, 46 as of 2014.
Forty-seven breed varieties have won Best in Show awards, as of 2013.
Seven dogs have won more than one Best in Show. The most recent was an English springer spaniel named Chinoe's Adamant James, who won in 1971 and 1972.
Timeline: 1870s - The Westminster Kennel Club is started by a group of men who frequently meet at the Westminster Hotel in New York and are interested in dogs.
1876 - The Westminster Kennel Club decides to put on an annual dog show to improve breeds of dogs and to raise public interest.
May 8-10, 1877 - The WKC presents the "First Annual New York Bench Show of Dogs." The show is held at Gilmore's Gardens at Madison Avenue and 26th Street in New York City. The show is so popular with the public, it is extended an extra day.
1888 - The date of the show is moved from May to February.
1907 - The show presents its first Best in Show award, to a smooth fox terrier named Ch. Warren Remedy. He also wins in 1908 and 1909.
1921 - The show changes from four days to three days.
1923 - Best in Show is not awarded while the American Kennel Club works to put standards and regulations in place to ensure uniformity.
1941 - The show becomes a two-day event.
1984 - The biggest dog to win Best in Show is Seward's Blackbeard, a 155-pound Newfoundland.
1988 - The smallest dog to win Best in Show is Great Elms Prince Charming II, a 4.5-pound Pomeranian.
2009 - Best in Show is a Sussex spaniel, "Ch Clussexx Three D Grinchy Glee," a.k.a. "Stump." At 10, he is the oldest winner in show history.
2013 - "GCH Banana Joe V Tani Kazari," aka "Banana Joe" or Joey, becomes the first affenpinscher to win Best in Show. "Bugaboo's Picture Perfect," aka Swagger, an English sheepdog, is named Reserve Best in Show, a runner-up award reintroduced for the 2013 show after not having been awarded since 1925.
2014 - "Sky," a female wire fox terrier, wins Best in Show. This is the 14th time that a wire fox terrier has won Best in Show, more than any other breed.