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2012 4:5 anakuro anthro anus backsack balls butt canid canine canis digital_media_(artwork)domestic_dog feet genitals german_shepherd greyscale herding_dog hindpaw kanic looking_at_viewer looking_back male mammal monochrome muscular muscular_anthro muscular_male nude pastoral_dog paws presenting raised_tail rear_view simple_background sketch smile solo tail white_background