In this article Fritz Jahr considers the 5th Christian Commandment: "You shall not kill", including in his analysis the need to ban the killing not only of human beings, but also other living things, especially animals.
Jahr proposes that both humans and animals share a ’proximity’ [nahestehen], not only physiologically but also psychologically.
He takes some references from the visual arts, through the work ’You shall not kill’ [Du nicht sollst töten] by Fidus, in which a child protects a fawn; and also from music, through the thoughts of Richard Wagner concerning the indignation and compassion caused by the presence of a tortured animal.
The final warning regarding the care of animal life is based on a duty to God, as expressed by Jonas: "if we want to honor the Creator, we must consider his creatures with admiration and respect, which are also the animals, which we know that he loves (Jonah 4:11), and take them into consideration as he commanded: ’You shall not kill!’”
[Abstract by Irene Cambra Badii]