Make animal Euthanization illegal

for years animals that nobody wanted have been killed through Euthanization, which is a greek word meaning "good death" first of all there is nothing good about killing animals nobody wants. They would never kill a child in an orphanage, or an elderly person in a nursing home, or a vegetable on life support (without family consent) so why animals? is it because they can't speak, or read? this is a pressing problem, if we ever want to achieve world peace, we have to start at home, this includes not killing the innocent.