"Now, according to the established order of Nature, (which we must suppose to prevail, or we cannot reason at all upon the subject,) the three methods by which life is usually put an end to, are, acute diseases, decay, and violence. The simple and natural life of brutes is not often visited by acute distempers; nor could it be deemed an improvement of their lot, if it were. Lot it be considered, therefore, in what a condition of suffering and misery a brute animal is placed, which is left to perish by decay. In human sickness or infirmity, there is the assistance of man's rational fellow-creatures; if not to alleviate his pains, at least to minister to his necessities; and to supply thee of his own activity. A brute, in his wild and natural state, does every thing for himself. When his strength, therefore, or his speed, or his limbs, or his senses fail him, he is delivered over, either to absolute famine, or to the protracted wretchedness of a life slowly wasted, by the scarcity of food. Is it, then, to see the world filled with drooping, superannuated, half-starved, helpless, and unhelped animals, that you would alter the present system of pursuit and prey?"
January 1, 1970
https://en.wikiquote.org/wiki/Wild_animal_suffering