I bought my tubby little morgan mare a grazing muzzle so I could put her out on the lush grass without any worries of her developing laminitis. She has no clue what to do and just stands around looking very depressed because she can't eat. I have fed her grass through the little hole to try and show her, but she just doesn't get it!!! Has anyone used one of these before? How did you teach your horse how to use it? Will she just eventually figure it out for herself? Help!!!