A man in uniform tries to find something with the help of a sniffing dog.
A guy in a uniform looks around with a dog.
Guy refers to man who looks around  to find something with the help of a sniffing dog.
exists p1 s1 x1 x2 x4.(n_help(x4) & a_topic(x1) & in(x1,x2) & Topic(x2,p1) & exists e1 x3 x5 x6.(with(e1,x4) & of(x4,x5) & n_dog(x5) & of(x5,x6) & n_sniffing(x6) & Theme(e1,x3) & Actor(e1,x2) & v_find(e1) & n_thing(x3)) & n_try(x2) & a_uniform(s1) & Theme(s1,x2) & n_man(x1))
exists e1 s1 x1 x2 x3.(a_around(s1) & Manner(e1,s1) & with(e1,x3) & n_dog(x3) & Actor(e1,x1) & v_look(e1) & in(x1,x2) & n_uniform(x2) & n_guy(x1))