iirc the dog was a dangerous animal and had attacked people and animals uprovoked quite a few times. didnt hear about it so not sure about the horses, but typically people dont just execute horses when they aren't injured or at risk of living out a traumatic existence. who knows, media spins and all that jazz, but I wouldn't hesitate to end a liability of a dangerous dog or a horse in suffering that had no chance of recovery, however reluctant id feel in the moment