Should I Change Generations to Teen?

Generations is an... interesting concept, to say the least. I'll try not to give away too many spoilers, but I need your help. Should Generations be rated Teen? I mean, it doesn't have any swearing, sex, or gore, but it does have basically a pony massacre in the beginning, which younger viewers might need to be warned about. What do you think? If your unsure, I'll PM you some more detailed ideas, but since they contain some major spoilers, I won't share them here.

Please respond!