We might be getting 2 more horses. They are sound and calm. We already have two horses male and female they are mean to other horses. Should we put them in their stalls and leave them there for a few days with the new horses?
Not knowing your facilities options and how mean your current horses are, I’ll give you some general advice and ideas.
First of all, many horses appear mean when actually they are just establishing their pecking order – the social order in a herd – who is top horse and who is next and so on. But some horses ARE mean – they are grouchy and aggressive. I don’t know which yours are but will refer to them as the mean horses as you did.
When the new horses arrive, if they are used to living together, you can house them together, such as in a large covered pen while they get used to the sights and sounds of their new home.
Their pen should not have a common fence line or panel line or wall with your current “mean” horses. But they should all be able to see each other.
Let them live this way for as long as it takes for everyone to settle in.
Then depending on your facilities, you can either start housing the horses closer to each other or begin mixing them. I don’t know how safe your fencing is, but if it is tall, strong and safe, you could put the least mean of your horses in a pen next to the two new ones. As long as the new horses’ pen is large enough that they can avoid being next to the mean horse if they want, eventually the 3 horses will work out some sort of agreement. It might takes several days.
Then you could return the first mean horse to his regular pen and bring the other one over to live next to the two new ones. Once all the horses have had a chance to get used to each other, you could consider adding one of the mean horses to the group of two new horses. Be sure the area you do this in is large enough so that all three horses have enough room so as not to get cornered.
The main thing is to take the time it takes to let the horses get used to each other.
You might find that one of the mean horses isn’t really mean and shows that he prefers to live calmly with the two new horses while the other mean horse truly is mean and needs to be housed alone.
Enjoy the opportunity to observe horse behavior and be safe !