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anthro balls barefoot biped bouncing_penis butt canid canine canis clothing domestic_dog erection feet front_view genitals hat headgear headwear humanoid_genitalia humanoid_penis legs_up lying male mammal monochrome moobs mostly_nude motion_lines nickelchad nipples on_back overweight overweight_anthro overweight_male penis plantigrade sam_and_max samuel_dog signature solo spread_legs spreading tongue tongue_out vein veiny_penis