A dog chases a sheep in an enclosure.
A dog is not on a leash.
THERE IS NOT LEASH BECAUSE THERE IS AN ENCLOSURE
exists e1 x1 x2 x3.(in(e1,x3) & n_enclosure(x3) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_sheep(x2) & n_dog(x1))
exists x1.(-exists p1 x2.(on(x1,x2) & n_leash(x2)) & n_dog(x1))