Hundreds of dogs in the park are getting ready for a walk or race as people admire them.
The dogs are being walked by cats.
If the dogs are getting ready for a walk or race, then it is not correct to claim that they are already being walked. Dogs being walked by cats is a different event than dogs being walked by people.
exists e1 p1 p2 x1 x2 x3.(n_thing(x3) & n_park(x3) & exists e2 x5.(Theme(e2,x3) & Actor(e2,x5) & v_admire(e2) & n_people(x5)) & as(e1,p2) & exists s1 x4.(for(s1,x4) & (n_walk(x4) | n_race(x4)) & Theme(s1,x1) & a_ready(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_get(e1) & of(x1,x2) & in(x2,x3) & n_dog(x2) & n_hundred(x1))
exists e1 x1 x2.(n_dog(x1) & Actor(e1,x2) & n_cat(x2) & Theme(e1,x1) & v_walk(e1))