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anthro balls biped brian_griffin canid canine canis digital_media_(artwork)domestic_dog family_guy flaccid floppy_ears fur genitals grey_background hi_res humanoid_genitalia humanoid_penis looking_at_viewer male mammal muscular muscular_anthro muscular_male nude penis simple_background smile smirk solo standing white_body white_ears white_fur zetsubouironfang