abs animal_genitalia animal_penis anthro balls biceps big_balls big_penis black_nose canine_penis fur furniture genitals hair half-closed_eyes huge_penis knot looking_at_viewer lying lying_on_sofa male muscular muscular_anthro muscular_male narrowed_eyes nipples on_back on_sofa open_mouth pecs penis sofa solo stretching thick_penis vein veiny_biceps veiny_knot veiny_muscles veiny_penis yawn yawning_position vulvexx bernese_mountain_dog canid canine canis domestic_dog mammal molosser mountain_dog swiss_mountain_dog hi_res