FURVERT!

absurd_res anatomically_correct anatomically_correct_anus anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis anus backsack balls big_butt black_hair butt dock_(anatomy)equid equine equine_anus equine_genitalia equine_penis feral fur genitals grey_body grey_fur hair half-erect heiken hi_res hooves horse laser_(artist)looking_at_viewer looking_back looking_back_at_viewer male mammal medial_ring open_mouth penis presenting presenting_anus presenting_balls presenting_hindquarters presenting_penis puffy_anus quadruped raised_tail rear_view solo tail tail_anus