rule 34 2023 all fours anthro anus ass athletic athletic anthro athletic male back muscles backsack balls black body black fur black nose bodily fluids brown body brown fur canid canine canis claws collar collar only dobermann domestic dripping erection feet finger claws fur genital fluids genitals hi res hindpaw humanoid hands klaus doberman character looking at viewer looking back looking back at viewer male mammal multicolored body multicolored fur nude paws penis perineum pinscher pose precum precum drip presenting presenting hindquarters rear view smile solo toe claws toes two tone body two tone fur yanzer 7531191