Twinkle has an excellent relationship with my brother-in-law's two staffs. They are ages 8 and 5, a boy and a girl. Both have been very well-socialised with other dogs of all sizes and have never shown agression to another dog or a person. I think it comes down to the individual dog rather than the breed as a whole. Having said that Twinkle is bigger than your little one, which would probably be my main concern......but as both your yorkie and the staff are pups I think they'll be fine together, with constant supervision
xxx xxx