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age_difference animal_genitalia anus belly bite biting_lip canid canine canine_genitalia canis clothed clothing dipstick_ears domestic_dog duo ear_markings featureless_crotch female feral fur genitals hair hi_res male male/female mammal markings multicolored_ears null nullo penis puppyratcat scar sex simple_background size_difference tail thigh_sex white_ear_tips