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abs anthro balls biceps big_penis biped black_and_white butt canid canine canis clenched_teeth domestic_dog erection flexing fur gaslight gaslightdog genitals grin hands_behind_head hi_res humanoid_genitalia humanoid_penis line_art looking_at_viewer lying male mammal megalodon_(artist)monochrome muscular muscular_anthro muscular_male nipples nude on_back pecs penis pose presenting simple_background sitting sketch smile solo tail teeth white_background wolf