Good article. Sometimes "common sense" should be used first. Make sure you have a place to separate a new horse "before" you bring the new one home.
when we get a new horse in to board we have 8 horses already I have a ky mountain mare that stays with the new horse for 1 or 2 days and won't let any of the other horse's around it until the other horse's are used to it. I have never saw anything like it.