When I first start taking my young horses out.... I use two leads... one with a chain shank and the other without. That way I only have to use it if I need it. As for the wild horses.... I don't know what to tell you there.
But for the two not liking being seperated... It would actually be good for them to be seperated.
Many people have sighed for the 'good old days' and regretted the 'passing of the horse,' but today, when only those who like horses own them, it is a far better time for horses. ~C.W. Anderson