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"Carbon Dog becomes Diamond Dog after taking damage of several hundred HP. Now it's your turn to suffer. DD is hard. Use Multi-Bottle Rockets right away before it puts up its counter shield. Also use shield killer."
EarthBound Player's Guide

The Diamond Dog (ダイヤモンドドッグ, Diamond Dog) is a boss in EarthBound, the second and final form of the Carbon Dog, and the final "Your Sanctuary" boss. This form of the Carbon Dog is stronger; however, its ability to breathe fire is now replaced with the ability to use powerful Diamondizing bites, which as the name of the attack implies, has a strong chance of diamondizing party members. When this form is first activated, the boss gains Shield β, and will reflect the move that caused its transformation provided it was physical.

The Diamond Dog is able to use PSI now, along with standard biting attacks. It may also howl, which has no effect. It will display text reading "Diamond Dog is emitting a glorious light!" and can kill you and other party members in one hit rarely. Upon defeating the Diamond Dog, Ness gains entrance to the eighth Your Sanctuary location, Fire Spring.


Text Displayed Power PP Possible Effects
Used a biting attack Low N/A Damages one target
Used a biting attack High N/A Damages one target
Bit hard Low N/A Damages one target, chance to Diamondize
Emitted a glorious light N/A 32* PSI Flash Ω
Shield β N/A 10 Physical Counter Shield

*[Citation Needed]


  • Diamond Dog's name appears to be a reference to the 1974 David Bowie album Diamond Dogs and/or its title track.
  • The Diamond Dog has the biggest experience points reward in the entire game - a whooping 337k points.
  • The transformation from Carbon Dog to Diamond Dog refers to the process of carbon becoming diamond through exposure to extreme heat and pressure.
    • The allusion to this transformation could serve as an additional reference to the 1981 Queen song "Under Pressure", a duet with David Bowie (who had also co-written the song).
  • Similar to Titanic Ant, the first sanctuary boss, Diamond Dog has two different attacks with the same text.
  • If the player uses Shield β when the Diamond Dog uses the Bit hard attack, there is a chance it will diamondize himself, leading to an instant win.