I have come to the conclusion that Gucci does not have good dog-social skills, she's great with humans, but she wants nothing to do with dogs.
I am dog-sitting 4, yes...FOUR havs right now and they stay together (granted, they are a pack and belong to the same home) but Gucci....she sits on the other side of the room, I take them out to play in the yard and Gucci plays on the OTHER side of the yard, unless, of course, there is a fight or misbehaving and then Gucci will put her police hat on and go stop it (she doesn't tolerate breaking the law!!)
But really.......she honestly just prefers to be alone or with humans.
And I remember her breeder telling me that before she was even old enough to come home, that she would ditch her littermates and go lay by the humans..and watch them from afar.
So, I do think this is more of personality trait than it is inherited behavior and it is probably one of the reasons why I only have 1 havanese...that, and I like to take her to work and traveling and jet setting to beaches, so I guess it works out that my singleton prefers her own company, or mine