A big brown dog plays with a smaller gray dog on the grass.
Two dogs are playing.
A big brown dog and a smaller gray dog can be more generally referred to as two dogs.
exists e1 s1 s2 s3 s4 x1 x2 x3.(n_grass(x3) & with(e1,x2) & on(x2,x3) & n_dog(x2) & a_gray(s4) & Theme(s4,x2) & r_more(s3) & a_smaller(s3) & Theme(s3,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_big(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_play(e1) & n_dog(x1) & card_eq_2(x1))