Part of what you can do is provide socialization. Our yorkie is great with kids of all ages, but, we have intentionally and SAFELY had her around kids her whole life. Lots of kids--at a dance studio! We always hold her and let her observe...kids arent' allowed to touch her. She is wonderful.
I would be very intentional with establishing your role as alpha and making sure the yorkie knows his place. Also, I would work on socialization with him. It will help |