I like happy endings.
5.56mm
I’ve not had the opportunity to do that for a kitty or puppy, but did do it for a couple of young rat snakes a few years ago. I’d had some landscaping done on my property and they laid a nylon net down to help keep grass seeds in place. A couple of baby rat snakes got caught in the net and I cut them out, freeing them. I’ve always been proud of myself for that act of humanity.