The large brown dog is sniffing a small white dog.
Two cats fight over a mouse.
Two dogs are mentioned in the 1st sentence, not 2 cats.
exists e1 s1 s2 s3 s4 x1 x2.(n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_large(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_sniff(e1) & n_dog(x2) & a_white(s4) & Theme(s4,x2) & a_small(s3) & Theme(s3,x2))
exists x1 x2 x3.(a_topic(x1) & over(x1,x3) & n_mouse(x3) & n_fight(x1) & of(x1,x2) & n_cat(x2) & card_eq_2(x1))