Like most of us, I've had the experience of hitting and killing a dog. and a cat. In neither case was there anything I could possible have done about it.
Banjer: I hope that you never have the experience of hitting an adult. One dark night many years ago, I came around a curve, and there was a man standing in the center of the highway who made no attempt to get out of the way. I swerved and went off the road, but I still killed him. He had wandered away from a bus tour of a group of emotionally disturbed adults, and somehow ended up in front of me on the highway, a hundred miles away from where he got separated. It's definitely worse than hitting a dog.
That said, my sympathy goes out to our Guest. I know the pain of killing any animal.
Jerry