FURVERT!

2013 anthro anus backsack balls big_butt biped black_body black_fur black_nose blush brown_body brown_eyes brown_fur butt canid canine canis domestic_dog fur genitals legs_up looking_at_viewer lying male mammal mastiff molosser nude on_back perineum pose presenting presenting_hindquarters rottweiler simple_background solo spread_legs spreading thick_thighs vamplust