Want know more about Shih Tzu, here vital statistic from this dog :

*  Life span: 12-14 years
* Adult weight: 9-16 pounds
* Adult height: 8-11 inches
and Shih Tzu also have good and bad :

Pros:

* Gentle, loyal, and affectionate
* Lacks the “attitude” of some Toy breeds; i.e., he isn’t yappy, demanding or high-strung
* Usually gets along with other pets

Cons:

* Grooming must be frequent and thorough; his coat tangles and mats easily
* Don’t get this dog unless you’re willing to commit to the
grooming demands
* Needs air conditioning. He can’t handle heat and humidity or other extreme temperatures.