VERSION 1.4.12: What's New? This is a small update to fix a bug that caused horses (and possibly pigs) to respawn with players when they die.
I might add a feature to make horses/pigs respawn with players some time in the future, but the way it was allowed players to get horses into blacklisted worlds.
That's all for now, and thanks @Turbotailz for pointing out the bug to me.