anthro anus backsack balls big_balls butt forest fur genitals grin looking_at_viewer looking_back looking_back_at_viewer male markings muscular muscular_male outdoor_nudity plant presenting presenting_anus presenting_balls presenting_hindquarters raised_tail smile solo spread_legs spreading striped_body striped_fur striped_markings stripes tree white_body white_fur sysns canid canine canis mammal wolf hi_res