Having been present at my own dog being put to sleep, I can say being put to sleep can be pretty awful for the animal, too. My dog had terminal cancer, and was clearly suffering, but given the choice, he would have chosen to live. He certainly struggled to live as he was dying.
I don't profess to know what the right thing to do in these situations is, and I am not saying that you are wrong, just that it is not so clear cut as that. Especially if the dog is still having good days (which the essay does not say one way or the other).
I don't profess to know what the right thing to do in these situations is, and I am not saying that you are wrong, just that it is not so clear cut as that. Especially if the dog is still having good days (which the essay does not say one way or the other).