I don't actually have a German Shepherd Costume so I threw on my typical clothes along with a mask and ... ran into a unicorn. The horn actually glowed AND it made magical twinkling sound. I don't know why it's hooves are so close to it's body like it was nervous. Maybe I ran into a shy-corn?
Anyway, my customized mask was made by Merimask on DA. merimask.deviantart.com/