My Dad once told me a story that I know still bothers him, even 60 plus years later. As a farm kid growing up in rural Canada in the 1950's, Dad would take just about any job offered to him that an 11 or 12 year old boy was capable of. One of the neighbors had a fur farm, raising mink in pens for sale to the fur markets in Toronto and Montreal. My Dad's job was to feed the mink all the bits and scraps of old miking cow or dead stock that the farmer had cut up into little pieces and left in the wheel barrow for him. One day, another neighbor walked in an old nag of a horse that was destined for either that wheel barrow, or the glue factory. A price was agreed upon, and the farmer brought out his old single shot .22 to dispatch the horse right there in the yard, as it would make excellent feed for his mink.
Dad watched as the farmer put the muzzle to the side of the horse's head, pulled the trigger and saw the horse fall. The men began the task of skinning the horse, getting about half way done, when the horse jumped up, neighing and whinnying and running around the yard. As the story goes, the horse was going wild, bucking and bleeding and trailing half of it's skin behind him, and the farmer had to fetch out that old single shot .22 again. Dad said that from his position, hiding underneath the old Allis-Chalmers tractor, that the farmer had to shoot that old nag 7 or 8 more times, having to reload between each shot, before it went down again.
He tells this story with such a vivid recollection, that I know he is still bothered about it. As a consequence, he is not a hunter, and does not like horses either.
I remember this story every time I take an animal while hunting, ready with a follow up shot should I need it.