FURVERT!

1:1 aaron_(artist)animal_genitalia animal_penis anthro armpit_hair balls big_knot body_hair bottomwear bottomwear_down canid canine canine_genitalia canine_penis canis clothed clothing domestic_dog erection genitals german_shepherd greyscale herding_dog hi_res knot knotted_penis male mammal monochrome muscular muscular_anthro muscular_male pants pants_down partially_clothed pastoral_dog pecs penis sketch solo tongue tongue_out topless vein