Greater Dog is a guard dog and a miniboss encountered in Snowdin Forest. It can be later found as an NPC in Grillby's when the protagonist spares it in battle. It is a member of the Royal Guard.
General Description:
Greater Dog's fur is wholly white. It wears mantle-gray armor adorned at the wrists with apparently functional dog faces, similar to the spear weapon it holds during battle. Greater Dog itself only fills the smallest neck portion and the tail area of the armor while controlling the rest of the suit through unknown means. When it jumps out of the suit, its "hands" seem to withdraw into the armor and do not reappear when it hops back in backwards.
Items:
A spear weapon adorned with dog faces, matching the design on its armor.
Personality
Affectionate and Attention-Seeking: Greater Dog is incredibly affectionate and constantly seeks attention. Dogamy warns the protagonist of facing the full brunt of Greater Dog's playful attitude if they are not careful of where they sit down in Grillby's bar.
Status:Alive in True Pacifist Route and some Neutral Routes, Deceased in some Neutral Routes and Genocide Route (Is killed by The Human in some of the neutral routes and the genocide route)
Alignment:Neutral Good (A member of the sentries, who tries to capture humans to save monsterkind)
↑ 4.04.14.24.34.44.54.64.74.8Undertale Library Blue Book "While monsters are mostly made of magic, human beings are mostly made of water. Humans, with their physical forms, are far stronger than us. But they will never know the joy of expressing themselves through magic. They'll never get a bullet-pattern birthday card..."
↑ 6.06.16.26.36.46.5Undertale Library Orange Book "Because they are made of magic, monsters' bodies are attuned to their SOUL. If a monster doesn't want to fight, its defenses will weaken. And the crueller the intentions of our enemies, the more their attacks will hurt us. Therefore, if a being with a powerful SOUL struck with the desire to kill... Um, let's end the chapter here..."
↑Undertale Waterfall Plauqes "If a monster defeats a human, they can take its SOUL. A monster with a huamn SOUL... A horrible beast with unfathomable power."
↑Because they are made of magic, monsters’ bodies are attuned to their SOUL. If a monster doesn’t want to fight, its defenses will weaken. And the crueler the intentions of our enemies, the more their attacks will hurt us. Therefore, if a being with a powerful SOUL struck with the desire to kill... Um, let’s end the chapter here...
↑Undertale Library Dark Green Book "Love, hope, compassion... This is what people say monster SOULs are made of. But the absolute nature of "SOUL" is unknown. After all, humans have proven their SOULs don't need these things to exist."