I don't believe there is any justifiable reason for killing any animal unless perhaps if it's killing you! That would be negotiable.
It's interesting to me that killing damages the image of God when it's done by a person, but it doesn't damage it when it's done by the state.
And when he is obliged to take the life of any one, to do so when there is a proper justification and manifest reason for it; but above all he must abstain from taking the property of others, for men forget more easily the death of their father than the loss of their patrimony.
Killing of animals for food is one thing, but on the other hand they do not exist simply as things to be slaughtered. This is true of fishing, too. Many men fish and leave their victims to rot and stink. But what about the fish? Has he no rights - not to be romanticized as though he were a man - but real rights?
If a mosquito has a soul, it is mostly evil. So I don't have too many qualms about putting a mosquito out of its misery. I'm a little more respectful of ants.
I believe that the place where an animal dies is a sacred one. There is a need to bring ritual into the conventional slaughter plants and use as a means to shape people's behavior. It would help prevent people from becoming numbed, callous, or cruel. The ritual could be something very simple, such as a moment of silence. In addition to developing better designs and making equipment to insure the humane treatments of all animals, that would be my contribution.
I don't myself believe that, even when we fulfil our minimum obligation not to cause pain, we have the right to kill animals.
Animal life is also sacred to the Creator. A Christian may kill animals to provide food and clothing or to protect himself from sickness and danger … But it is wrong to mistreat animals or to kill them just for sport or pleasure.
Watchtower Bible and Tract Society of New York
Few people ever kill for the right reasons, June. Most do it for the wrong reasons. I just hope you never have to be in either category.
The right to kill: supposing the life of X ... were linked with our own so that the two deaths had to be simultaneous, should we still wish him to die? If with our whole body and soul we desire life and if nevertheless without lying, we can reply 'yes'> then we have the right to kill.