Originally Posted by CurlyIsASpecialStandie
Why would someone put marshmallow into their horse's mouth?
I can name a lot of people that use it on the international stage. If your horse is not foaming at the mouth, and then gapes it, it is really obvious because there is a big red tongue peeking out at the judges (both of these things are contact issues which is a whole 'nother discussion). So to hide the gaping mouth, right before heading into the ring you get your groom to scoop a handful of marshmallow paste and smear it all on the inside of the horse's mouth and a little on his lips.
From far away you can't really tell if it's paste or foam, but on close ups it is obvious that the foam is foamed saliva and the paste is sticky and sugary and sticks to everything. But it's not illegal, so whatever works I guess...