2017all_foursanimal_genitaliaanimal_penisanthroanusbacksackballsbarefootbipedbirthmarkbuttclawsdigital_drawing_(artwork)digital_media_(artwork)equine_genitaliaequine_peniserectionfeetfurgenitalshairlooking_at_viewerlooking_backlooking_back_at_viewermalemammalmarblesodamarkingsmedial_ringmismatched_animal_penismismatched_genitaliamismatched_penisnanomoochinesnudepawpadspawspenisperineumpresentingpresenting_anuspresenting_hindquartersraised_tailred_eyesrodentsciuridsimple_backgroundsmilesolotailteethtoe_clawstree_squirrelveinveiny_peniswhite_background