Both the larger dog and the smaller dog have their mouths open.
Both dogs are panting.
Just because their mouths are open doesn't mean they are panting.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(n_mouth(x4) & of(x4,x2) & n_thing(x2) & n_dog(x2) & n_dog(x2) & r_more(s2) & a_smaller(s2) & Theme(s2,x2) & r_more(s1) & a_large(s1) & Theme(s1,x2) & Theme(e1,x4) & Actor(e1,x1) & v_have(e1) & Theme(s3,x5) & a_open(s3) & (x4 = x5) & Time(x1,x3) & n_both(x3) & subset_of(x2,x1))
exists e1 x1.(n_dog(x1) & Actor(e1,x1) & v_pant(e1))