Question: What year was the series to which the episode "Slicked-up Pup" belongs created?

full_context: Document 1: Tom and Jerry: Tom and Jerry is an American animated series of short films created in 1940, by William Hanna and Joseph Barbera. It centers on a rivalry between its two title characters, Tom and Jerry, and many recurring characters, based around slapstick comedy.
Document 2: Spike and Tyke (characters): Spike and Tyke are fictional characters from the "Tom and Jerry" animated film series, created by William Hanna and Joseph Barbera. Spike Bulldog (who goes by different names in a few episodes - Killer for four episodes, Butch for two episodes, and Bulldog for one) is portrayed as an American bulldog, who is generally friendly and amiable, and a loving father to his son Tyke in several episodes. However, Spike's character also has a very stern, and fierce side, for occasions such as when he is defending his son Tyke.
Document 3: Posse Cat: Posse Cat is a 1954 one reel animated "Tom and Jerry" short. As with all "Tom and Jerry" cartoons at the time, it was directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley. The short was animated by Irven Spence, Ed Barge, Kenneth Muse and Ray Patterson, the usual quartet of animators who dealt with the vast majority of "Tom and Jerry" shorts in the Hanna and Barbera era. The backgrounds was credited to Robert Gentle. It was released on January 30, 1954 by Metro-Goldwyn-Mayer.
Document 4: Tom and Jerry: A Nutcracker Tale: Tom and Jerry: A Nutcracker Tale is a 2007 animated holiday themed fantasy comedy direct-to-video film starring "Tom and Jerry" produced by Warner Bros. Animation and directed by Spike Brandt and Tony Cervone. It is loosely based on the story "The Nutcracker and the Mouse King" by E. T. A. Hoffmann, with Jerry in the role of the Nutcracker, while Tom played one of the King Mouse's (who, in this version, is replaced with a cat) henchmen.
Document 5: Tom and Jerry Meet Sherlock Holmes: Tom and Jerry Meet Sherlock Holmes is a 2010 animated mystery comedy direct-to-video film starring Tom and Jerry produced by Warner Bros. Animation. It is the first Tom and Jerry direct-to-video film to be produced without any of its original creators, William Hanna and Joseph Barbera. In the city of London, a crook is stealing jewels around the Scotland Yard, and Red, a beautiful singer, is being framed for this crime. Tom and Jerry, as assistants, must help Sherlock Holmes look for clues and track down the real thief to solve this case.
Document 6: Puss n' Toots: Puss n' Toots is a 1942 American one-reel animated cartoon and is the 6th "Tom and Jerry" short. It was produced in Technicolor and released to theatres on May 30, 1942 by Metro-Goldwyn Mayer and re-issued on April 24, 1948 and again on August 8, 1958. It was animated by Pete Burness, George Gordon, Jack Zander, Irven Spence, and Bill Littlejohn with additional animation by Ray Abrams. The name of the short is an allusion to the fairy tale Puss 'n' Boots.
Document 7: Busy Buddies: Busy Buddies is a 1956 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley. The cartoon was animated by Irven Spence, Lewis Marshall, Kenneth Muse and Ed Barge, with backgrounds by Robert Gentle and layouts by Richard Bickenbach. "Busy Buddies" was the 100th cartoon of the 118 that Hanna and Barbera directed during their tenure at MGM. It was released on May 4, 1956 by Metro-Goldwyn-Mayer and also the first cartoon to feature Jeannie the babysitter (voiced by Janet Waldo) and a mischievous baby that kept crawling off, both of whom would return in the 114th and final cartoon, "Tot Watchers".
Document 8: Slicked-up Pup: Slicked-up Pup is a 1951 American one-reel animated cartoon and is the 60th "Tom and Jerry" cartoon directed by William Hanna and Joseph Barbera and produced by Fred Quimby. The cartoon was scored by Scott Bradley and animated by Ed Barge, Kenneth Muse, Irven Spence and Ray Patterson. It features the second appearance of both Spike and Tyke together (although Tyke is referred to as 'Chip').
Document 9: Tom and Jerry: The Movie: Tom and Jerry: The Movie is a 1992 American animated musical buddy comedy film starring Tom and Jerry, produced and directed by Phil Roman, released by Miramax Films and LIVE Entertainment in the U.S.
Document 10: Pup on a Picnic: Pup on a Picnic is a 1955 one reel animated "Tom and Jerry" short directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley. The cartoon was animated by Ray Patterson, Kenneth Muse, Ed Barge and Irven Spence, with backgrounds by Robert Gentle. It was released on April 30, 1955 by Metro-Goldwyn-Mayer.
Document 11: Smarty Cat: Smarty Cat is the 95th one reel animated "Tom and Jerry" short, created in 1955, and released on October 14, 1955 by Metro-Goldwyn-Mayer. The cartoon was directed by William Hanna and Joseph Barbera and produced by Fred Quimby, William Hanna and Joseph Barbera with music by Scott Bradley. "Smarty Cat" was animated by Kenneth Muse, Michael Lah, Ed Barge and Irven Spence, with backgrounds by Vera Ohman and the layouts by Richard Bickenbach. It integrates footage from previous shorts into the plot. The name is the pun on the phrase "smarty pants." While most "Tom and Jerry" cartoons end with their ending titles, it is the only "Tom and Jerry" cartoon to not end with its ending title but with an MGM cartoon ending title.
Document 12: Little Quacker: Little Quacker is a 1950 American one-reel animated cartoon and is the 47th "Tom and Jerry" short directed by William Hanna and Joseph Barbera and produced by Fred Quimby. It is the first Tom and Jerry short to be released in the 1950s. Little Quacker marks the debut of the eponymous character, Quacker the duckling who would go on to appear in seven more shorts, making him one of the more enduring supporting characters in the Tom and Jerry cartoon series. The voice of Quacker and his parents (who make their only speaking appearance in this cartoon), along with a single WAH WAH! line by Tom, was supplied by (uncredited) Red Coffee; Coffee's rendition of Quacker's voice was mostly an impersonation of Disney's Donald Duck as performed by Clarence Nash.
Document 13: Tom's Photo Finish: Tom's Photo Finish is a 1957 one reel animated "Tom and Jerry" short directed and produced by William Hanna and Joseph Barbera with music by Scott Bradley. The cartoon was animated by Kenneth Muse, Bill Schipek, Lewis Marshall, Jack Carr, Herman Cohen and Ken Southworth, with backgrounds by Robert Gentle and layouts by Richard Bickenbach. It was released on November 1, 1957 by Metro-Goldwyn-Mayer.
Document 14: Tom and Chérie: Tom and Chérie is a 1955 one reel animated "Tom and Jerry" short directed by William Hanna and Joseph Barbera and produced by Fred Quimby with music by Scott Bradley. It was the third (of four) cartoons in the "Mouseketeer" series of cartoons to take place in France, the first of which, "The Two Mouseketeers" (1952) won an Academy Award, and the second, "Touché, Pussy Cat!" (1954) received an Academy Award nomination.
Document 15: Joseph Barbera: Joseph Roland "Joe" Barbera ( or ; ] ; March 24, 1911 – December 18, 2006) was an American animator, director, producer, storyboard artist, and cartoon artist, whose film and television cartoon characters entertained millions of fans worldwide for much of the 20th century.
ground_truth: 1940