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5_toes abs anthro balls barefoot biceps biped canid canine canis chestnuts_(artist)darkened_balls darkened_genitalia darkened_penis domestic_dog feet firefighter flaccid fur genitals gus hands_behind_head humanoid_feet humanoid_genitalia humanoid_penis lying male mammal muscular muscular_anthro muscular_male nipples nude on_side paws pecs penis plantigrade pose presenting simple_background solo toes white_background