a small tan dog running on the grass with a ball in his mouth
A dog caught a ball.
Just because the dog has a ball in his mouth does not mean he caught it. He could've picked it up.
exists e1 s1 s2 x1 x2 x3 x4 x5.(n_mouth(x5) & of(x5,x3) & n_male(x3) & n_grass(x3) & a_topic(x1) & with(e1,x4) & in(x4,x5) & n_ball(x4) & on(e1,x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1) & a_tan(s2) & Theme(s2,x1) & a_small(s1) & Theme(s1,x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_ball(x2) & n_dog(x1))