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5_fingers anthro anus athletic athletic_anthro athletic_male back_groove backsack balls bare_back black_and_white border_collie canid canine canis collie domestic_dog fingers fluffy fluffy_tail genitals herding_dog light_body light_hair light_tail lopped_ears lying male mammal michael_collin monochrome nude on_front open_mouth pastoral_dog rallyreki rear_view sheepdog shoulder_blades simple_background snout solo tail tongue tongue_out