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Nightmare Fuel: Tiny Toon Adventures
One segment of the Halloween episode "Toons From The Crypt" had Elmyra, an animal lover whose affection was always disastrous for the target animal, mourning her late pets... whereupon they rose from the dead Zombie Apocalypse-style, as hideous zombies and came after her. Their being zombified didn't prevent her from lavishing her destructive affections on them, however. One truly scarring moment shows her plunking a zombie dog and cat into a tub of soapy water to give them a bath. But then she pulls out her hands and they're covered in muck. In other words, they fell apart in the water.
There was a short in Tiny Toon Adventures that was a variation on the usual Michigan J. Frog shorts… in which the frog was dead, and awaiting dissection in a biology class, but came back to life when the teacher's back was turned. It was immeasurably creepy – especially the ending, where Hamton tried to bury it in a pet cemetery, but all the other animals came back to life…and sang. “Jeepers, creepers, hey wake up you sleepers! Jeepers, creepers, come and get this guy!“ Lyrics branded on this troper's soul.