Is classifier/measure word required after demonstrative? I have been reading into this topic and found a bit conflicting information - some say it is mandatory to put a classifier after demonstrative (e.g. zhè), while some say it actually is not mandatory.

For example a question "what's name of this cat", I have seen the following phrase:


  zhè māo jiào shén me míng zì? 这猫叫什么名字 ？ 


so I think, should it not be with zhī?


  zhè zhī māo jiào shén me míng zì? 这只猫叫什么名字？ 


Are both options correct? As I do not know characters much yet, I would be grateful for pinyin in the answers, if possible.
You should really have a measure word after a number or 'this' and 'that'. Therefore, 'zhe zhi mao' is the correct option.