A leashed dog is in the backyard of someone's home.
A leashed dog is being walked.
You can not infer he is being walked.
exists p1 s1 x1 x2.(n_backyard(x2) & exists x3 x4.(in(x1,x2) & of(x2,x4) & n_home(x4) & of(x4,x3) & n_person(x3)) & n_dog(x1) & a_leashed(s1) & Theme(s1,x1))
exists e1 s1 x1.(Theme(e1,x1) & v_walk(e1) & n_dog(x1) & a_leashed(s1) & Theme(s1,x1))