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Nightmare Fuel: Peanuts
What A Nightmare Charlie Brown!: Snoopy is abused and starved, becomes feral, and then dies getting pulled into a frozen lake, screaming and clawing for his life. One could argue that this was inappropriate for the Peanuts specials' target audience.
In one strip, Charlie Brown, not having a kite to fly, attaches some string to Snoopy's collar and uses him as a kite, who uses his ears to create the lift needed to fly. But it doesn't work for long, and Snoopy plummets to the ground and SHATTERS into a hundred pieces!! Luckily it was just Snoopy having a nightmare from eating too much before sleeping, but still, that image of him shattering in front of his master must've upset a LOT of kids at the time!