Dogsong

"Dogsong" is the 21st track in the Undertale Soundtrack. It plays during the battle against the Greater Dog miniboss and in most encounters with the Annoying Dog. It is composed using the soundfont of Mario Paint and Mario Paint Composer, although some notes are too low to replicate in either game. Dogsong has an altered and sped up melody from Enemy Approaching.

A faster, higher pitched version of this song plays if the player decides to spare Sans when presented the opportunity during the Genocide Route, whilst showing the message "geeettttttt dunked on!!!".

It again plays in two of the endings of the game. In the Neutral Route Ending where you kill all the bosses but do not kill any monsters, it plays while Sans explains that "a little white dog" took the throne, and the underground is better than ever. It also plays at the end of Hard Mode when Annoying Dog interrupts and ends the game, to Toriel's annoyance.

It also plays during the "Dirty Hacker" ending, which can only be achieved by reaching the ending by way of altering the game's files.

A very slowed down, distorted, echo-intensified version of this song is found while fighting Endogeny, one of the Amalgamates. A slightly slower version of the song also plays once Endogeny is able to be spared.

The song that plays in the Temmie Village's Tem Shop is a version of Dogsong with different instrumentation.