Two dogs walk along a path beside the grass.
Two dogs are chasing each other.
The two dogs are chasing each other which implies that they are not walking.
exists e1 x1 x2 x3.(n_grass(x3) & beside(e1,x3) & along(e1,x2) & n_path(x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1) & card_eq_2(x1))
exists x1.(all x2.(n_other(x2) -> exists e1.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1))) & n_dog(x1) & card_eq_2(x1))