I have a 3 year old yorkie. My cousin has a 1 year old female shih tzu, and my aunt and uncle have a 3 year old male shih tzu and a 1 year old male lorkie (lhasa apso/yorkie mix). Sapphire gets along great with the female shih tzu, but not so well with the males. I think it's because they tried mounting her. She was fine with them until that.
