Just cam e across this thread whilst browsing...I am also really stupid as I have bought a (now 8 months old) Irish draught colt (now gelded) as a companion to my mare. I've had horses forever, youngsters, ponies etc. but never thought that he would get sooo attached to my mare. We are currently taking her away for 10 - 20 mins at a time whilst someone else watches him in the stable, he rears and box walks, has jumped out twice in panic (I now have a fully closable gate on the top) and he is going to be about 16.2, which is why it's important to sort his behaviour out now. In every other way he is fine, I can handle him, lead him around in and out of the field, it's just when I shut him in and take her away he is mega distressed. The consequence is I haven't ridden the mare for 2 months (except to take her round the playing field next door for 5 mins), and now I'm worried that I might lose my nerve if I don't ride her 'cos she'll just get sharper and sharper!