Would it have anything to do with the way he is supposed to stack(I don't know if this is the correct terminology in the horse world)but basically the fancy stance saddlebreds do, kind of stretched out. I know he can stand like that he does it when he is going to get fed, he will stretch out and reach his neck out super far and tall so he can see what you are doing.. When he does it he looks just like one of the fancy show saddlebreds.
I will have to try and get a picture... He is a pain to get a picture of cause he will never leave me alone, he follows me everywhere. Lol