FURVERT!

4:3 anthro blue_eyes blue_seam_briefs blue_seam_underwear briefs briefs_only bulge bulge_from_behind canid canine canis clothed clothing colored_seam_underwear fudatsu full-length_portrait fur grey_body grey_fur hi_res legs_up looking_at_viewer looking_back looking_back_at_viewer lying male mammal on_front portrait raised_tail simple_background smile solo spread_legs spreading tail three-quarter_view topless topless_anthro topless_male underwear underwear_only white_briefs white_clothing white_underwear wolf zach_the_wolf