Here's a quick, little (and kinda late) animation for Undertale's Anniversary! Featuring The Annoying Dog in a bikini! (wut?)
If you're confused, here are the references:
Soulless Pacifist Version of this ending: https://www.youtube.com/watch?v=x6xD5hWo34w
From Toby Fox's Tumblr (And music source too): http://undertale.tumblr.com/post/150356427945/originally-i-was-going-to-make-it-if-you-beat-the
From Toby Fox's Twitter (Original Sprites came from): https://twitter.com/tobyfox/status/775867592078725120
Anyway, One year of Undertale! Man, time's quick, isn't it?