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anthro balls barefoot belly biped black_nose brown_body brown_fur canid canine canis compfive countershading domestic_dog erection feet fur genitals green_eyes grey_balls grey_belly grey_body grey_fur humanoid_genitalia humanoid_penis looking_at_viewer male mammal markings multicolored_body multicolored_fur nude paws penis pink_penis sitting smile solo spots spotted_body spotted_fur spread_legs spreading tail teeth