A shaggy dog runs down a dirt trail in a lush forest.
A black dog runs down the trail.
The dog is described as shaggy not as any particular color.  There is no way to infer that the animal is black or any other color.
exists e1 s1 s2 s3 x1 x2 x3 x4.(in(e1,x4) & n_forest(x4) & a_lush(s3) & Theme(s3,x4) & a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_run(e1) & n_trail(x2) & of(x2,x3) & n_dirt(x3) & n_dog(x1) & a_shaggy(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_trail(x2) & down(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))