That's wonderful!! Congratulations on being able to capture that moment and thanks for sharing it with us!
It does take them awhile sometimes. Toto isn't socialized with other animals and we have been trying for over a year with little results .... she is just very aloof and pretty much ignores them. We recently had one of her Yorkie friends, Shira, over for a few days sleepover. They actually
both lay on the sofa
at the same time!! We were elated ... they usually give each other a very wide berth!! Believe me, I know how you felt about Brutus & Vito finally warming up to each other!