2017 4_toes anal anal_penetration aniboxer black_markings blue_fur boxer_(dog) canine digital_media_(artwork) dog double_anal double_penetration eyes_closed fox foxgear from_behind_position fur grabbing_from_behind grey_fur group hair hand_on_leg lying male male/male mammal markings nature nude on_back outside patrikthedog paws penetration reverse_missionary_position sex snow_(sxsnow) toes tongue tongue_out torso_grab white_fur wolf yellow_fur  2013 anal anal_penetration aniboxer animal_genitalia anthro anus balls brown_fur butt canine canine_penis colored cum cum_in_ass cum_inside dog duo erection fur gay grey_fur knot linaraya male mammal nude open_mouth penetration penis poog sex smile tongue tongue_out yellow_fur