A large, white dog, with a fluffy tail is running on grass.
A big dog with four legs is running on the grass.
While dogs typically have four legs, not all dogs do. Some dogs have only two or three legs. The presence of a dog does not imply it has four legs.
exists e1 s1 s2 s3 s4 x1 x2 x3.(on(e1,x3) & n_grass(x3) & Actor(e1,x1) & v_run(e1) & with(x1,x2) & n_tail(x2) & a_fluffy(s4) & Theme(s4,x2) & n_dog(x1) & a_white(s3) & Theme(s3,x1) & a_,(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(n_grass(x3) & on(e1,x3) & Actor(e1,x1) & v_run(e1) & with(x1,x2) & n_leg(x2) & card_eq_4(x2) & n_dog(x1) & a_big(s1) & Theme(s1,x1))