a dog wearing a yellow collar is bearing his teeth at another dog that is sitting by a tree.
A dog is upset by another dog.
Bearing his teeth implies that someone is upset by something.
exists e3 e1 e2 s1 x1 x2 x3 x4 x5 x6 x7.(at(e2,x5) & by(e3,x7) & n_tree(x7) & Actor(e3,x6) & v_sit(e3) & (x5 = x6) & n_dog(x5) & -(x5 = x1) & n_dog(x1) & n_dog(x1) & Theme(e2,x4) & Actor(e2,x1) & v_bear(e2) & n_tooth(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_collar(x3) & a_yellow(s1) & Theme(s1,x3) & (x1 = x2))
exists e1 x1 x2.(Actor(e1,x2) & n_dog(x2) & -(x2 = x1) & n_dog(x1) & n_dog(x1) & Theme(e1,x1) & v_upset(e1))