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anthro backsack balls big_balls big_butt big_penis butt canid canine canis castbound darkened_genitalia dialogue domestic_dog english_text flexible genitals hair hi_res holding_leg humanoid_genitalia humanoid_penis male mammal muscular one_leg_up penis raised_leg russell_(castbound)short_hair short_tail solo splits spread_legs spreading standing tail talking_to_viewer text thick_thighs vertical_splits