@shekinahcancook I don't think you're giving the goat enough respect. Under certain ethical systems, it's no excuse that you need B12 or you can't survive without eating the goat. Per some ethical systems (I.e., answers to the trolley problem) you should take your own life rather than kill someone else. What gives you the right to kill a goat to survive?
I'm not saying this is my ethical system, just a plausible one.