The brown dog is being chased by a black dog while holding a small toy in his mouth.
The dogs are playing tag.
The brown dog being chased by the black dog is the same as the dogs playing tag.
exists e1 e2 s1 s2 s3 x1 x2 x3 x4.(n_mouth(x4) & of(x4,x1) & n_male(x1) & n_dog(x1) & a_brown(s1) & Theme(s1,x1) & while(e1,e2) & in(e2,x4) & Theme(e2,x3) & Actor(e2,x1) & v_hold(e2) & n_toy(x3) & a_small(s3) & Theme(s3,x3) & Actor(e1,x2) & n_dog(x2) & a_black(s2) & Theme(s2,x2) & Theme(e1,x1) & v_chase(e1))
exists e1 x1 x2.(n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_tag(x2))