premise: A woman is holding a dog on a leash in front of a small pier.
hypothesis: The woman holds the leash to prevent the little dog chasing the cat
explanation_1: The dog may be kept on a leash for a number of different reasons, not necessarily to prevent the little dog chasing the cat.
explanation_2: It may have been a large dog instead of little with no cat in the vicinity.
explanation_3: Sentence 1 doesn't mention the size of the dog, so we can't assume it is little. Also, it doesn't mention a cat or that the woman is holding the leash for a particular reason such as to prevent the dog chasing a cat.
premise_logic: exists e1 s1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_pier(x5) & a_small(s1) & Theme(s1,x5) & n_front(x4) & on(e1,x3) & n_leash(x3) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & n_dog(x2) & n_woman(x1))
hypothesis_logic: exists e1 p1 s1 x1 x2 x3 x5.(n_cat(x5) & n_dog(x3) & a_little(s1) & Theme(s1,x3) & n_leash(x2) & n_woman(x1) & Topic(e1,p1) & exists e3 e2 x4.(Theme(e3,x3) & Actor(e3,x1) & v_prevent(e3) & Theme(e2,x5) & Actor(e2,x4) & v_chase(e2) & (x3 = x4)) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1))
premise_sim: exists e1 s1 x1 x2 x3 x4 x5.(v_hold(e1) & on(e1,x3) & of(x4,x5) & n_woman(x1) & n_pier(x5) & n_leash(x3) & n_front(x4) & n_dog(x2) & in(e1,x4) & a_small(s1) & Theme(s1,x5) & Theme(e1,x2) & Actor(e1,x1))
hypothesis_sim: exists e1 p1 s1 x1 x2 x3 x5.(v_hold(e1) & n_woman(x1) & n_leash(x2) & n_dog(x3) & n_cat(x5) & exists e3 e2 x4.(v_prevent(e3) & v_chase(e2) & Theme(e3,x3) & Theme(e2,x5) & Actor(e3,x1) & Actor(e2,x4) & (x3 = x4)) & a_little(s1) & Topic(e1,p1) & Theme(s1,x3) & Theme(e1,x2) & Actor(e1,x1))