premise: The dog's mouth is open like he is yawning.
hypothesis: a dog is yawning because he is tired from a walk
explanation_1: A dog yawning does not imply he is tired from a walk.
explanation_2: The dog's mouth could be open in the motion of barking, not only yawning.  There is no statement indicating that the dog is returning from a walk only that it looks like he is yawning, but this does not imply he is tired only that his mouth resembles a yawn.
explanation_3: Dog is not necessarily yawning because he is tired from a walk.
premise_logic: exists p1 s1 x1 x2.(n_male(x1) & n_mouth(x2) & of(x2,x1) & n_dog(x1) & exists e1.(Actor(e1,x1) & v_yawn(e1)) & like(s1,p1) & Theme(s1,x2) & a_open(s1))
hypothesis_logic: exists e1 p1 x1.(exists e2 x2.(from(e2,x2) & n_walk(x2) & Theme(e2,x1) & v_tire(e2)) & n_male(x1) & because(e1,p1) & Actor(e1,x1) & v_yawn(e1) & n_dog(x1))
premise_sim: exists p1 s1 x1 x2.(of(x2,x1) & n_mouth(x2) & n_male(x1) & n_dog(x1) & like(s1,p1) & exists e1.(v_yawn(e1) & Actor(e1,x1)) & a_open(s1) & Theme(s1,x2))
hypothesis_sim: exists e1 p1 x1.(v_yawn(e1) & n_male(x1) & n_dog(x1) & exists e2 x2.(v_tire(e2) & n_walk(x2) & from(e2,x2) & Theme(e2,x1)) & because(e1,p1) & Actor(e1,x1))