Carbon Dog

Carbon Dog is the 8th and final Sanctuary Boss fought in EarthBound. It guards Fire Spring, the last Your Sanctuary location in the game. Carbon Dog can't use PSI during this stage. Carbon Dog's attacks include spewing a fireball, which is a regular fire attack, making a piercing howl that has no effect, using a low level bite attack, shooting out a spray of fire (PSI Fire Ω), and to charge forward, which is a high level attack. After being defeated, Carbon Dog turns into Diamond Dog.

Diamond Dog
Diamond Dog is the 2nd form of Carbon Dog. It appears when Carbon Dog's HP goes below a certain amount. Diamond Dog has higher defenses and offense than Carbon Dog, but is less gutsy. It also has PSI. Diamond Dog's attacks include Shield β, emitting a glorious light (PSI Flash Ω), a low level and high level biting attack, making a piercing howl that does nothing, and biting the target hard to Diamondize them. After the fight, Diamond Dog yields 337738 exp. and $6968.