The black and tan dog is chasing something he has spotted.
The puppy is chasing the cat.
Just because a dog is black and tan is doesn't mean it is a puppy or that the something it spotted was a cat.
exists e2 e1 s1 s2 x1 x2 x3.(n_male(x1) & n_dog(x1) & a_tan(s2) & Theme(s2,x1) & a_black(s1) & Theme(s1,x1) & Theme(e2,x2) & Actor(e2,x1) & v_chase(e2) & Theme(e1,x3) & Actor(e1,x1) & v_spot(e1) & (x2 = x3) & n_thing(x2))
exists e1 x1 x2.(n_cat(x2) & n_puppy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1))