Originally Posted by Ellieandrose
In my opinion you can just put him with the other horses that he will be with and they will sort out the pecking order within a few days. Once the pecking order has been made and your horse is used to the property then start easing him in to work.
All horses are nervous when you bring in an outsider bc they like routine and don't know what their new position in the herd will be. It happens to people in businesses, too.
UNLESS your new horse is the obvious new herd leader you will probably have a new horse injury and a new Vet bill. Don't do this.
I have introduced many new horses to existing herds. They need to be separated by a fence for about 1-3 months, so that they can introduce themselves to each other. Then, they need to be handled and ridden and trailered together. When you see that they have established herd order, THEN you can test it by supervising the new horse turned out with ONE member of the herd at a time, preferably by starting in the enclosure with the new horse, then adding one of the herd at a time.
Only ONCE did I not have a horse fight when a new horse came into the herd first day. It was when I had made a temporary fence to "protect" my newly acquired 15yo horse, "Tyke" (toughest horse I have EVER met!) from the herd. He broke down the fence, took over, relegated the previous leader to an outsider, and let the old mare and the pony eat with him.