FURVERT!

abs aereous anatomically_correct animal_genitalia animal_penis anthro ball_size_difference balls beastars big_balls big_penis big_sheath bird_dog body_hair canid canine canine_genitalia canine_penis canis comparing domestic_dog duo erection fur genitals grey_balls grey_body grey_fur grey_sheath hi_res huge_balls huge_penis hunting_dog interspecies jack_(beastars)knot knot_size_difference labrador legoshi_(beastars)looking_at_another male male/male mammal muscular muscular_anthro muscular_male nipples penis penis_envy penis_size_difference red_nipples red_penis retriever sheath shower tan_balls tan_body tan_fur tan_sheath vein white_balls white_sheath wolf