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1:1 anthro anus balls canid canine canis claws digital_media_(artwork)dobermann domestic_dog erection fur genital_piercing genitals greyscale hair hi_res looking_at_viewer male mammal matthew_nightingale monochrome nipple_piercing nipples nude penis penis_piercing piercing pinscher presenting prince_albert_piercing smile smirk solo spread_anus spreading wendi_g0 wings