That must be traded off against a “prolonged suffering rate of X%” as the overwhelmingly likely alternative.

We chose to euthanize our dog this summer. No matter how obvious her medical condition was, I still questioned whether we did it too early, too late, or just right. (Upon reflection, I think very slightly too late [by days or maybe a week].) I also couldn’t help but compare that experience to that of people. In many ways, I think we treat our family pets with more compassion.