animal_genitalia animal_penis anus barn black_hooves brown_body brown_fur duo equine_penis feral fur genitals hay holster hooves inside male male/male penis pink_anus pink_balls pink_penis pink_tongue standing tongue tongue_out white_body white_fur cow_of_fire equid equine horse mammal shaded
The brown horse is observing what the horse anus looks like without a horse tail.