The Papi Tzu is not a purebred dog. It is a cross between
the Papillon and the
Shih-Tzu.
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.

Pressley, the Papi Tzu. She is the ½ Shih Tzu and ½
Papillon. Her owner states, "She is just a joy!" In this pic she is 8½
weeks old, and weighs 1.8 pounds