"Best in Show" is a 2000 American mockumentary comedy film co-written and directed by Christopher Guest. The film humorously follows five dog owners as they compete with their dogs in a prestigious dog show. It features improvised dialogue and a quirky ensemble cast including Eugene Levy, Catherine O'Hara, and Fred Willard. The movie is a satire on the competitive and eccentric world of dog shows, celebrated for its humor and character-driven comedy. It has received positive reviews and is considered a classic in the mockumentary comedy genre.