Pluto

Pluto (also known as Pluto the Pup) is a popular character made famous in a series of Disney short animations. Pluto has most frequently appeared as Mickey Mouse's pet dog. He also had an independent starring role in a number of Disney shorts in the 1940s and 1950s. Pluto is unusual for a Disney character in that he is not anthropomorphized beyond showing an unusually broad range of facial expressions; he is actually represented as a normal dog. His birthday is September 5, 1930.

Personality
Pluto is very sneaky and well trained. Pluto is very protective of Mickey as well. Pluto can also be very playful and wild. Pluto has a habit of chasing small animals such as gophers and chipmunks. Pluto is also a clever character. Pluto is no fool and can smell danger a mile away. Pluto is also feared by villains such as Pete. Pluto also have a unhealthy friendship with Donald Duck. Pluto and Donald can be enemies at times but can also be great friends. Pluto's most famous for being the best friend of Mickey Mouse. Pluto and Mickey both have their ups and downs but in the end they are still best friends. Pluto is one of the few characters in the Mickey and Friends cast that can not speak. Although Pluto has been known for saying yeah, yeah yeah! Pluto can easily be dumbstruct by female dogs such as Fifi. Pluto will risks his life to impress a beautiful dog as well as rescue one.

History
Pluto first appeared in the 1930 Mickey Mouse cartoon The Chain Gang as a bloodhound on the trail of escaped prisoner Mickey Mouse. The bloodhound character was adapted into Minnie Mouse's dog, Rover. His name was later changed to Pluto and his owner to Mickey Mouse, making him Mickey's best pal. As such, Pluto is considered one of the "Fab Five" Disney animated characters alongside Mickey Mouse, Minnie Mouse, Donald Duck and Goofy.

Pluto is also considered one of the first Disney characters to break out of the "rubber hose and circle" formula style the studio had relied on; the dog's design gave him the appearance of actually being round instead of flat. In addition, Pluto is one of the first cartoon characters that is actually shown to have thought processes through the use of character animation. His thought processes are showcased in a landmark scene from 1934's Playful Pluto, in which Pluto becomes stuck to a piece of flypaper and attempts to figure out a way to get himself unstuck.

Mickey Mouse Works
Pluto appears as a main character in the animated series Mickey Mouse works and is once again givin his own cartoon series as well as a short subject Pluto Gets the Paper.

Disney's House of Mouse
Pluto appears once again in the series House of Mouse as the club's official mascot. Pluto also appears in Mickey's Magical Christmas: Snowed in at the House of Mouse, where he tries to help Donald get into the christmas spirit. In the film Mickey's House of Villains Pluto only appear in a cartoon short Mickey's Mechanical House, but not in the rest of the film.

Mickey Mouse Clubhouse
Pluto reappears as a main character in the computer animated series Mickey Mouse Clubhouse. Pluto joins in nearly every adventure Mickey and Friends set off on and helps the gang solve many puzzling problems.

Quack Pack
He also had a cameo appearance in the first episode of Quack Pack.

Who Framed Roger Rabbit
Pluto may also be spotted in cameo of Who Framed Roger Rabbit from 1988.

The Prince and the Pauper
Pluto did return in The Prince and the Pauper in 1990 with Mickey, Donald, Goofy, Horace Horsecollar, Clarabelle Cow, and Pete the Cat, and also The Prince who looks like Mickey and take over his place.

Runaway Brain
Pluto returned in Runaway Brain in five years later.

Mickey's Once Upon a Christmas
Pluto appears in the last segment as Mickey's faithful dog and co worker. Pluto helps Mickey gain enough money to buy Minnie a chain for her watch. When their boss Pete fires them and take their money Pluto tries to find a way to help Mickey gain more money. Mickey and Pluto end up performing at a charity and after the performence Mickey realizes he can maybe trade his harmonica for the chain. The owner states the harmonica is not worth much and when he hears Mickey sad melody on the harmonica he changes his mind. Pluto and Mickey return to Minnie's home and his present was a bone.

Mickey's Twice Upon a Christmas
Pluto appears in the last segment in the computer animated film sequel. In the short Pluto runs away from Mickey after having a fight with Mickey. Pluto runs into a train and ends up in the North Pole. Pluto meets and befriends Santa's seven reiundeer who name him Murry. Pluto begins to miss Mickey while back in town Mickey is looking for Pluto. Mickey meets Santas Claus and tells him about missing Pluto. Santas returns home and finds Pluto with his reindeer Donnar and Blitson. Santa and the reindeer return Pluto home. Mickey and Pluto reunite and celebrate christmas together.

Mickey, Donald and Goofy: The Three Musketeers
Pluto appears in the animated film along with Mickey and an all star cast of Disney characters. Pluto helps Mickey, Donald and Goofy achieve their dreams in becoming musketeers and win their true loves hearts.

Kingdom Hearts series
Majority of information taken from Kingdom Hearts Wiki-Pluto.

Pluto is King Mickey's loyal pet dog and also appears to be a messenger for him in some Kingdom Hearts games. He debuted in the 1930's animated cartoon The Chain Gang. Pluto has so far appeared in all games released so far, except Kingdom Hearts 358/2 Days.

Kingdom Hearts Birth by Sleep
Pluto makes a brief cameo in Terra's story as he enters Disney Town. He also appears alongside Queen Minnie when Aqua visits the town, as well. During Aqua's storyline Pluto barked says goodbye to Aqua in the flashbacks with Minnie, Daisy, Horace, Chip 'n' Dale, and Huey, Dewey and Louie. During the credits, Pluto watched Huey, Dewey and Louie are having car race with Minnie, Horace Horsecollar and Chip 'n' Dale with cheering who won.

Kingdom Hearts
Pluto has a minor role in Kingdom Hearts but a notable one. Pluto is found by Donald in the throne room of Disney Castle with a letter from the King who has gone missing (he has actually gone off to fight the Heartless). Pluto later sleeps during the conversation of options between Queen Minnie, Donald, Goofy, Daisy Duck and Jiminy Cricket. Donald, Goofy and Jiminy are sent to locate the King and the Keyblade Master. Pluto hops into the Gummi Ship at the last moment as it departs.

In Traverse Town, the group witness the disappearance of a star and rush off to find Leon. Pluto wanders off into an alley way, discovering an unconscious Sora, who the dog wakes up with a lick and a sudden shove. Sora asks Pluto where they are, but the dog seems to hear something and rushes off. He disappears for the remainder of the game, although it's possible he was reunited with King Mickey - as he appears suddenly at the end-credits scene carrying a letter with the King's seal. Sora, Donald and Goofy chase him over the hills.

Kingdom Hearts: Chain of Memories
Pluto has a brief appearance in Kingdom Hearts: Chain of Memories at the beginning. Sora, Donald and Goofy spot that he is carrying an envelope with the King's seal. Pluto rushes off, the three running after him. However, it appears they lost track of him or gave up due to it being night. However, the pursuit of Pluto leads the trio to a crossroad which eventually leads to Castle Oblivion, and the events of the game. It is possible this Pluto is actually a memory form created by Naminé in order to lure Sora to the castle.

Kingdom Hearts Re:Chain of Memories
Pluto appears in Kingdom Hearts Re:Chain of Memories as an exclusive friend card. Pluto's main ability is to dig up items such as health points, Moogle points, and even cards for Sora to use in battle. When sleighted in two's and three's, the Pluto cards create a sleight called Lucky Bounty. Lucky Bounty Lv3 digs up an amazing amount of items for Sora. The great thing about Pluto card is that it doesn't take up a slot in Sora's three friend capacity. The bad thing is that it is uncommon to find. Be sure to save one if you do find it and stock up to Lv3. Lv3 Lucky Bounty gives out better cards. Be aware that cards dug up during Lucky Bounty disappear after battle. Pluto may even dig up Item cards you used, ready to be used again. He also may dig up a bone which causes damage to Sora.

Kingdom Hearts II
Pluto returns in Kingdom Hearts II, oddly in The World That Never Was for unknown reasons, although he seems to be tracking Axel. He chases Axel into an alley only to lose him once he enters a Corridor of Darkness, but a hidden Riku opens another for him. Pluto arrives on Destiny Islands just in time to prevent Kairi from going with Axel. Pluto and Kairi escape into Twilight Town where they meet Hayner, Pence and Olette. Axel soon appears and kidnaps Kairi, and Pluto chases after them.

Pluto and Kairi end up imprisoned in a cell in the Castle That Never Was. They are rescued by Naminé and escape. They are soon confronted by Saïx, but Riku appears in his disguise as Xehanort's Heartless and chases him off. As Riku is about to leave, Pluto blocks his path and moves Riku in the direction of Kairi. Riku allows Kairi to remove his hood. Pluto disappears until the defeat of Xemnas, leaping into a corridor made by Naminé which leads to Destiny Islands. Despite the fact that Kairi, Donald, Goofy, King Mickey and Pluto passed through the portal to the islands, Pluto was not present when Sora and Riku returned. Pluto is seen in the credits with Huey, Dewey, Louie, Uncle Scrooge, Donald, Goofy and King Mickey when they return to Disney Castle.

In Kingdom Hearts II, Pluto apparently takes a liking to Kairi, as he spends most of his time with her, does not hesitate to follow Axel as he escapes with her, and attempts to comfort her when they are locked in the Castle's basement.

Kingdom Hearts coded
Pluto first appeared in Episode 2 when Sora fixes Traverse Town's Bug Block Corruption and the Journal shows everyone in Disney Castle's computer the message "Their torment has been lessened" and a scene is shown, from the first game, where Sora, Donald, and Goofy first meet. The scene shifts to show Pluto in the background running into a Corridor of Darkness.

Disney Parks
Pluto is a common character in the Disney Parks, the most common after Mickey, Minnie, Donald and Goofy. He is featured in many shows.

Fantasmic!
In the popular live show Fantasmic Pluto can be seen in the Steamboat Willie in Disney's Hollywood Studios and The Mark Twain Riverboat in Disneyland.

Celebrate the Season
Pluto appears in the holiday show in Disney's Magic Kingdom park. In the show Pluto joins Mickey and Friends as they celebrate the magic of Christmas.

Cinderella's Royal Coronation
Pluto appears as a guest member in the live castle show in Tokyo Disneyland. In the show Pluto along with many Disney characters celebrates Cinderella's crowning.

Trivia

 * Pluto was also shown to be the pet of Donald Duck and Goofy on occasions.
 * Pluto spoke once in his career - "Kiss Me" in The Moose Hunt.
 * Like Sora becoming friends with Donald and Goofy, and Riku and King Mickey; Pluto may be the Disney friend to the original character, Kairi, in Kingdom Hearts II, as he keeps her company during her capture in The World That Never Was.
 * Since Pluto has traveled through the Corridors of Darkness in Kingdom Hearts II, it can be questioned if it had any effect on Pluto's heart (most likely not, for his loyalty to Mickey and the cause of good is too strong.)
 * Though Bill Farmer voices both Goofy & Pluto, the credits of Mickey, Donald & Goofy: The Three Musketeers mention that only Goofy is been voiced by Bill Farmer in that movie. IMDB mentions also Pluto's name by Bill Farmer's voice.