There is a scientist named Jagadish Chandra Bose who has made a machine which shows that trees and plants are able to feel pain when they are cut. And we can see directly that when someone comes to kill an animal, it resists, it cries, it makes a horrible sound. So it is a matter of the development of consciousness. But the soul is there within all living beings. But metaphysically, the life of man is sacred.
Human beings think on a higher platform than the animals do.
The animal eats to maintain his body, and you also eat in order to maintain your body. The cow eats grass in the field, and the human being eats meat from a huge slaughterhouse full of modern machines. But just because you have big machines and a ghastly scene, while the animal simply eats grass, this does not mean that you are so advanced that only within your body is there a soul and that there is not a soul within the body of the animal. That is illogical. We can see that the basic characteristics are the same in the animal and the human being.