rule 34 2021 5 fingers anthro anus ass athletic athletic anthro athletic male back muscles backsack balls big penis black body black fur black nose brown body brown fur canid canine canis claws clothing collar crouching digital media artwork digitigrade dobermann domestic feet fingers footwear fur genitals hindpaw humanoid genitalia humanoid hands humanoid penis kahlu klaus doberman character looking at viewer looking back looking back at viewer male mammal mostly nude multicolored body multicolored fur muscular muscular anthro muscular male nude paws penis perineum pinscher presenting presenting anus rear view shadow signature smile socks solo toe claws toeless footwear toeless socks toes two tone body two tone fur 5354431