A dog with its mouth opened.
A large dog with its mouth opened growling.
Dogs open their mouths for many reasons besides growling.
exists e1 x1 x2.(Actor(e1,x1) & v_open(e1) & with(x1,x2) & n_mouth(x2) & of(x2,x1) & n_thing(x1) & n_dog(x1))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_open(e1) & n_growl(x3) & with(x1,x2) & n_mouth(x2) & of(x2,x1) & n_thing(x1) & n_dog(x1) & a_large(s1) & Theme(s1,x1))