this is 100% canon in the Demon Kitty and Dark Chica au
also i love the idea of demon animals just seeing dark and thinking ‘fellow demon’ like imagine these random cats and dogs coming up to dark and he tries scaring them off by splitting his shell but then they respond by like splitting their heads in two or another pair of eyes popping up or letting out the most demonic screeching dark’s ever heard. and then it’s like well, they’ve proven themselves now, welcome to the demon family.
(and in the distance you can hear the jims going ‘IT’S DEMONS JIM”)