My wire fox terrier Boysie.
Double Vision Cairn
remember that first live action scooby doo movie. where the antagonist was literally scrappy doo and he was stealing peoples souls, like actually really stealing and absorbing souls, and was planning on taking scoobys soul to rule the world with an army of demons and get revenge on the gang after they abandoned him because he kept peeing in the car, and near the end he turned into this huge dog monster
a real movie
honestly? this was the biggest twist I think i ever experienced as a kid
you also neglected to mention smash mouth had their souls taken as well