A brown dog is biting a black dog.
Dogs are fighting.
A dog biting another dog implies that they are fighting each other.
exists e1 s1 s2 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_bite(e1) & n_dog(x2) & a_black(s2) & Theme(s2,x2) & n_dog(x1) & a_brown(s1) & Theme(s1,x1))
exists e1 x1.(Actor(e1,x1) & v_fight(e1) & n_dog(x1))