Relationships in Havanese are interesting. After Fiona and Treasure had pups together, they bonded in a big way. Till then, they didn't really play with each other. Now thy do silly crazy things together and I love it! Both were a tad too serious about life till they truly got together.
It takes time but partners in crime, so to speak often bring out the best in each other if you allow it to sort itself out. Havanese do find their relationships.
But when Treasure had her pups go home and she decided she was going to take over Fiona's? Fiona decided best pals and all, that's not right and Treasure listened.
I do believe they have a mutual respect for each other that grew and developed vs. just an instant thing. I suspect when it happens that way, it is a truly lasting bond.