rule 34 animal genitalia animal penis anthro aroused athletic athletic anthro athletic male balls biped blue eyes canid canine canine genitalia canine penis canis claws digitigrade dobermann domestic erection fur genitals head turned hi res knot looking at viewer male mammal multicolored body multicolored fur muscular paws penis pinscher prick ears sheath simple background sitting smile solo tagme two tone body two tone fur yookie 7867126