Two dogs, on standing on the other in the snow.
Two dogs are standing in a grassy field.
Dogs do not normally stand on each other.  They could be standing either in the snow or in the grass, not both.
exists e1 x1 x2 x3 x4.(n_snow(x4) & n_other(x3) & a_topic(x1) & in(e1,x4) & on(e1,x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_dog(x1) & card_eq_2(x1))
exists e1 s1 x1 x2.(in(e1,x2) & n_field(x2) & a_grassy(s1) & Theme(s1,x2) & Actor(e1,x1) & v_stand(e1) & n_dog(x1) & card_eq_2(x1))