There are two bottom-line ideas that inform my actions with regard to other living things, both as a hunter and as a keeper of animals:
1. Life feeds on life. Nothing lives without something else dying. There are no exceptions. That's just the way it is.
2. As a human, I am entrusted with stewardship of other life. I could write quite a lot about the implications to this; as a man who kills a good portion of my own meat, it's something I've thought about a lot. But for now, suffice it to say that I try never to kill light-heartedly or without good reason. That goes for feeding live food, butchering a chicken, or arrowing a deer.