Collie dog races around a pole.
The dog is chasing after his tail in the park.
The first sentence does not imply that the dog is racing around a pole because it is chasing after his tail.
exists x1 x2 x3 x4.(a_topic(x1) & around(x1,x4) & n_pole(x4) & n_race(x1) & of(x1,x3) & n_dog(x3) & (x1 = x2) & ne_nam_collie(x2))
exists e1 x1 x2 x3.(n_park(x3) & n_tail(x2) & of(x2,x1) & n_male(x1) & n_dog(x1) & in(e1,x3) & after(e1,x2) & Actor(e1,x1) & v_chase(e1))