Rocky the Cerberus

PLEASE READ! IMPORTANT TEXT! Rocky is a cerberus, which means they have three heads. Fenrir and Cerberus (Cerb for short) are the other two. Story: You are a scientist doing your job, the previous night you were begging the scientists not to put a shock collar on the Cerberus, They did it anyway, ignoring your warnnings. Suddenly alarms sound, A cerberus kicks open the door, they kill three scientists then see you, you back into a corner. He walks closer and leans in, you know, this could be the end of your life.