The Big ImageBoard (TBIB) - anal anal penetration anatomically correct anatomically correct genitalia anatomically correct penis animal genitalia animal penis balls black nose brown body brown eyes brown fur canid canine canine genitalia canine penis canis countershading dipstick tail domestic dog dominant duo erection feral feral on feral feral penetrated feral penetrating feral penetrating feral from behind position fully sheathed fur genitals german shepherd herding dog knot male male/male male penetrated male penetrating male penetrating male mammal markings mounting multicolored tail north shepherd nude pastoral dog penetration penis quadruped red penis sex sheath tail tail markings vailwolf white body white countershading white fur