Dog Dating
Dog Dating is listed as the 109th track in the Undertale Complete OST, an add-on to the original UNDERTALE Soundtrack. It is a remix of Dogsong, which shares a melody with Enemy Approaching. It is present on all the Fangamer releases of the soundtrack as an unlisted final track. It is only not unlisted on the Complete OST.
Dog Dating was one of the stretch goal rewards for the Undertale Kickstarter, alongside Dating Start (FM Version) and Bereavement.