Rule 34 Dev - 4_toes alpha_channel animal_genitalia animal_penis anthro balls border_collie canine canine canine_penis claws collie digital_media_(artwork) erection fur hair half-closed_eyes kingrusty knot male mammal multi_nipple mxrdoc nipples nude pawpads paws penis sheath simple_background sitting smile smirk smug solo toe_claws toes|3191581224