We have many ST in our neighborhood. Shadow with his underbite does NOT resemble these dogs at all. Nor does he have the temperment thankfully. He does not have a pushed in face at all.You will definitely love the puppy regardless! And I promise you, even a Havanese w an underbite won’t look like a shit tzu (nothing against them, but I’m not a huge fan of that look either) because they have the same gene as bulldogs and pugs etc that makes them ‘short faced.’ My puppy’s face is on the small side for a Havanese as far as I can tell (her facial features are very petite) and doesn’t have quite the same soulful look of my older guy because of it, but I think they’re both adorable!
I totally agree with your remarks.