A brown dog is standing in a river with its head turned looking behind.
A dog is standing in the river watching for other animals.
WE have no idea if the dog is watching for other animals, the dog could be looking for any other reason. We also have no idea if there are any other animals present.
exists e2 e1 e3 s1 x1 x2 x3 x4 x5.(Theme(e3,x5) & Actor(e3,x1) & v_turn(e3) & n_behind(x5) & Actor(e2,x5) & v_look(e2) & with(e1,x4) & n_head(x4) & of(x4,x1) & n_thing(x1) & in(e1,x3) & n_river(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3 x4.(n_animal(x4) & n_river(x2) & for(e1,e2) & for(e2,x3) & -(x3 = x4) & n_animal(x3) & Actor(e2,x1) & v_watch(e2) & in(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_dog(x1))