The Yorkie-Apso is not a purebred dog. It is a cross between the Yorkshire Terrier and the Lhasa Apso. The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and know you can get any combination of any of the characteristics found in either breed. Not all of these designer hybrid dogs being bred are 50% purebred to 50% purebred. It is very common for breeders to breed multi-generation crosses.
Layla, a Yorkie-Apso at 11 months old and weighing 6.5lbs. "The mother was Lhasa Apso and the father was Yorkshire Terrier."
ACHC, DDKC, DRA, IDCR, DBR