Well, ya gotta get to know the new guy first. Here's a big "Awwwww!!" for the romping together and face licking.
When my shih tzu was a pup, he taught our older rescued lhasa how to be a kid. The lhasa had never had a childhood (he was a 'stud' for all of his life). It was great to see him chasing the little guy around, and learning how to play!!