In the 6 dogs I've owned over the years, I can say that I've had one of those - my sheltie Blue was the one. Sort of odd how that happened as I didn't really pick him. We had gotten our very first registered sheltie - a beautiful blue merle girl we called Dallas. We sometimes visited the breeder and when Dallas was 6 months old, I got a call asking if I would consider taking a pup she had been planning on showing but who turned out a little too short. We hadn't really planned on 2 dogs, but I agreed to a one week trial. My first priority was the dog we already had. Having 2 dogs turned out to be easier than just the one - they got along so well together, so we opted to keep him. Hubby and the kids always preferred our original sheltie, she lived to play, but, guilty as I felt about it at the time, I fell in love with my sensitive Blue and his soulful eyes, and he became my dog. I was positively heartbroken when he died at the age of only 8. That was about 20 years ago and I still ocassionally think of him.
I don't know yet if Hanna and I will have that same relationship, I think she may end up being a daddy's girl. The pom I had that just died this past summer had that potential. Even though he had a completely different personality - very confident and outgoing, there was definitely something extra special about my little Dawson that made you smile just being around him.