Two dogs, on standing on the other in the snow.
Two dogs are experiencing snow for the first time.
Just because there are two dogs standing on the other in the snow, it doesn't mean that they are experiencing snow for the first time.
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 x3.(n_time(x3) & a_first(s1) & Theme(s1,x3) & for(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_experience(e1) & n_snow(x2) & n_dog(x1) & card_eq_2(x1))