So I have a raised coop that is inside of a 3 sided horse shelter and my hens scratch feed that falls to the ground where horses can get it. While both my QH gelding and pony mare enjoy it, I discovered today that the pony mare can actually fit her whole body under the coop so she can effectively lick up every morsel of the layer feed. I read one place "Keep horses out of chicken feed." But there was no explanation, why is this bad and do you think the quantity they spill and she licks is dangerous?