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“Undodog will help you correct a minor mistake by canceling your last action. You will quickly find that this hound is a great friend.”
Instruction manual, page 6, Mario Paint
SMM EventCourseThumb Walkin with Undodog.jpg
Species Dog
First appearance Mario Paint (1992)
Latest appearance Super Mario Maker 2 (2019)

Undodog (also formatted as Undo Dog) is a helpful character first appearing in Mario Paint, selectable as an icon in the bottom toolbox in the Art and Music modes. He is a tan colored dog that has pointed ears and a square box around his neck like a collar, meant to represent his selectable square icon on a game menu. The box surrounding his neck was black in the original Mario Paint, but became white starting with Super Mario Maker. His name is a pun on the word "underdog", and a portmanteau of the words "undo" and "dog", and, as his name states, he helps the player undo the last action performed.


Mario Paint[edit]

Sprite of Undodog (left) with his icon (right)

Undodog makes his debut in Mario Paint. His appearance in this game is that of a tan dog with a big head and a thin black box around his neck, like a collar, probably representing the outline of his icon. He will also dance and jump around at the bottom of the screen when the player is idle in the stamp editor or drawing board color selection. He will quickly run back to his original location if the player moves the mouse. If the player turns the game's music off and leaves it silent, Undodog will sometimes sneeze loudly. According to the instruction manual for the game, this is because of his allergies.[1]

Super Mario series[edit]

Super Mario Maker / Super Mario Maker for Nintendo 3DS[edit]

Undodog reappears in Super Mario Maker and Super Mario Maker for Nintendo 3DS with the same function as his original appearance: reverting the player's last edit whenever his icon is tapped. In this appearance, he has slightly more realistic proportions and he wears a white box resembling an Elizabethan collar instead of a black box. He also appears throughout the game outside of the course editor such as in the game's manual with Mary O. and Yamamura, riding a Reset Rocket in the background in Course World and when a player completes the 10-Mario or 100-Mario Challenges, and in the corner during Gnat Attack. When 10 seconds remain on the timer in Gnat Attack, he will start barking and jumping excitedly. If the player shakes the heart SFX, its icon will turn into Undodog wearing a surgical face mask. This SFX will cause static to appear briefly with a buzzing sound followed by the course's music turned off temporarily (or permanently, if it is equipped to Mario). The icon and the music being turned off is a throwback to Mario Paint where the bottom lever in the background music option has a similar appearance and effect when selected. A special event course titled "Walkin' with Undodog" also exists; completing it for the first time unlocks the Undodog costume.

Super Mario Maker 2[edit]

The 3D model of Undodog introduced in the story mode of Super Mario Maker 2.

Undodog reappears in Super Mario Maker 2 filling similar roles and having the same appearance as in Super Mario Maker. However, he also has a larger role in the game's story mode (appearing for the first time as a 3D model), providing Mario access to various jobs to help rebuild Peach's Castle. At the beginning of the story mode, Undodog excitedly jumps around and mistakenly presses the Reset Rocket button on the ground, completely erasing Peach's Castle. At the end, after the castle is entirely rebuilt, Undodog goes over to the Reset Rocket again and looks at it happily while everyone gasps off-screen. In the postgame, the castle is still standing, implying that Undodog left the button alone. Undodog can also be seen in the background of nighttime levels in most themes riding the Reset Rocket.[2]

Undodog talks to Mario as if he is a pet and even refers to Mario as a "good boy", while on the other hand Mario talks to Undodog by saying phrases such as "woof" and "bark". Additionally, after completing Story Mode, Undodog will tell the player jokes for 100 coins each. Ten jokes in total are told, with most referencing several in-game Course Maker elements, highlighted in blue in the jokes. Once Undodog runs out of jokes, the player can hear a previous one again for free, chosen at random.

  • "Why are ? Blocks so good at holding power-ups? Because they have so mushroom inside!"
  • "Where do Bowser's minions keep their chickens? In a chicken koopa!"
  • "What do you call a sad Dry Bones? A Cry Bones!"
  • "Whaddaya call a four-legged ghost with antlers? A Scare-A-Boo!"
  • "Why didn't Mario enter the Pipe in the desert? Because it was PIPING HOT!"
  • "Why is the Angry Sun so angry? Somebody ate all of its desert!"
  • "What do you call an aspiring Mario Maker? An up-and-plumber!"
  • "I just told some of my jokes at a Ghost House. They kept shouting "BOO! BOOOOOOO!"
  • "Why didn't Bowser replace his cracked fishbowl? He's too Cheep Cheep!"
  • "Why did the Lakitu record itself catching a squid? For the Blooper reel!"

WarioWare series[edit]

Undodog makes cameo appearances in the WarioWare: Touched! microgame, Mario Paint, and his icon can also be seen in the WarioWare: D.I.Y. microgame for Mario Paint.


Super Mario Maker for Nintendo 3DS[edit]

  • Digital instruction manual bio: "Each time you tap this icon, your last action will be undone through the power of Undodog."



Super Mario Maker 2[edit]

  • "Woof..."
  • "Woof... (It was an accident...)"
  • "Woof? Woof... (Seen that button around? I wanna jump on it again...)"
  • "Bark bark!"
  • "Bark! Bark bark! (Oh, you're rebuilding it! Good for you!)"
  • "Bark bark! (I have jobs!)"
  • "Bark! (Why thank you!)"
  • "Woof woooof?! (Who's a good boy?!)"
  • "Bark bark! (Hey, I have another job for you!)"
  • "Bark bark! (Hey! I've got another job for you.)"
  • "Bark bark! (Thanks for helping me out with those jobs!)"

Names in other languages[edit]

Language Name Meaning
Japanese イヌ[3] (Mario Paint)
1つもどる (Mario Paint)
Hitotsu modoru
アンドゥ犬 (Super Mario Maker)
Andu Inu

Back one

Undo Dog

Chinese (simplified) 重来狗
Chónglái Gǒu
Try Again Dog

Chinese (traditional) 重來狗
Chónglái Gǒu
Try Again Dog

Dutch Hond
French Undodog
Chien Annuler
Cancel Dog
German Rückgängig-Hund
Undone Dog
Italian Cancellino
Pun on cane ("dog") and cancellare ("to cancel"), with the diminutive suffix -ino
Korean 되돌리개
From "되돌리다" (doedollida, "to undo") and "개" (Gae, "dog"), or "~개" (-gae, Korean agentive suffix)

Portuguese Cão
Russian Пса
Пёс (Super Mario Maker 2)


Spanish Can-celín
Pun on cancelar ("to cancel") and can ("dog"), with the diminutive suffix -ín


  • The Mario Artist series also uses a dog's head as the "undo" icon in reference to Undodog. The dog here is different than Undodog, resembling a beagle instead.
  • While Undodog himself does not appear in Super Smash Bros. for Wii U, his sneezing sound effect is incorporated into the "Mario Paint Medley" music track.
  • When Undodog is telling a joke in Super Mario Maker 2, the music fades out. Afterward, audience laughter can be heard, which is the same audio as the "Guffaw" sound effect.


  1. ^ "When you click on the icon shaped like a treble clef, you can access a control panel that will let you change the background music. In this section, you can choose one of three different tunes. The fourth lever lets you work inside a quiet working environment. Don't be surprised, however, if Undodog's allergies cause him to sneeze occasionally." – Mario Paint instruction booklet. Page 19.
  2. ^ Nintendo (June 12, 2019). Super Mario Maker 2 Gameplay Pt. 3 - Nintendo Treehouse: Live | E3 2019. YouTube. Retrieved June 13, 2019.
  3. ^ Mario Paint Japanese instruction booklet. Page 13.