I have two sister horses who are both 3 years old. They go crazy if they can't see one another. How would I fix separation anxiety between them?

Do like Monday- Tuesday across from each other
Wednesday -thursday one stall/ pasture way
Friday - Saturday 2 stalls /pastures away
Sunday -monday 3 or more away if they are better
This worked for mine but I might take longer depends on how well they do just have to her horses around them !
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