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animal_genitalia anthro balls biped bull_terrier canid canine canis clothing detached_sheath domestic_dog freckles genitals holding_own_sheath holding_sheath hunting_dog kerchief male mammal masturbation muscular muscular_anthro muscular_male nude peable penile penile_masturbation penis penis_tip pose purple_eyes sheath sheathjob simple_background sitting solo spread_legs spreading terrier tongue tongue_out unknown_artist white_background